From e3286f9094ebb3fbed42260cafae49567f91aa65 Mon Sep 17 00:00:00 2001
From: Nils Pukropp <nils@narl.io>
Date: Fri, 6 Nov 2026 07:51:47 +0100
Subject: [PATCH] feat(weld): add sidechain test build

Weld will phase-align a bass layer to another layer it hears through the
sidechain. This first build only checks that FL Studio delivers the
sidechain to a CLAP aux port: it passes the main layer through unchanged,
meters the sidechain and offers Layer/Sum/Sum dry listening. No latency.
---
 .gitea/workflows/check.yml        |    4 +-
 .gitea/workflows/release.yml      |    2 +-
 Cargo.lock                        |   17 +
 Cargo.toml                        |    6 +-
 docs/weld/CHANGELOG.md            |    7 +
 docs/weld/README.md               |   32 +
 plugins/catalog.json              |   16 +
 plugins/weld/core/Cargo.toml      |   16 +
 plugins/weld/core/src/lib.rs      |  150 ++
 plugins/weld/core/src/settings.rs |   43 +
 plugins/weld/core/tests/dsp.rs    |   97 ++
 plugins/weld/plugin/Cargo.lock    | 2375 +++++++++++++++++++++++++++++
 plugins/weld/plugin/Cargo.toml    |   25 +
 plugins/weld/plugin/src/lib.rs    |  179 +++
 plugins/weld/plugin/src/params.rs |  104 ++
 plugins/weld/plugin/tests/host.rs |  226 +++
 plugins/weld/ui/Cargo.toml        |   13 +
 plugins/weld/ui/src/lib.rs        |  115 ++
 tools/editor-check/Cargo.lock     |   18 +
 tools/editor-check/Cargo.toml     |    2 +
 tools/editor-check/src/main.rs    |   33 +-
 21 files changed, 3471 insertions(+), 9 deletions(-)
 create mode 100644 docs/weld/CHANGELOG.md
 create mode 100644 docs/weld/README.md
 create mode 100644 plugins/weld/core/Cargo.toml
 create mode 100644 plugins/weld/core/src/lib.rs
 create mode 100644 plugins/weld/core/src/settings.rs
 create mode 100644 plugins/weld/core/tests/dsp.rs
 create mode 100644 plugins/weld/plugin/Cargo.lock
 create mode 100644 plugins/weld/plugin/Cargo.toml
 create mode 100644 plugins/weld/plugin/src/lib.rs
 create mode 100644 plugins/weld/plugin/src/params.rs
 create mode 100644 plugins/weld/plugin/tests/host.rs
 create mode 100644 plugins/weld/ui/Cargo.toml
 create mode 100644 plugins/weld/ui/src/lib.rs

diff --git a/.gitea/workflows/check.yml b/.gitea/workflows/check.yml
index 5d7dab2..af62731 100644
--- a/.gitea/workflows/check.yml
+++ b/.gitea/workflows/check.yml
@@ -22,7 +22,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        plugin: [rivet, patina, anvil, crucible, lathe, temper]
+        plugin: [rivet, patina, anvil, crucible, lathe, temper, weld]
     steps:
       - uses: https://github.com/actions/checkout@v4
         with:
@@ -60,6 +60,7 @@ jobs:
           cargo run --manifest-path tools/editor-check/Cargo.toml --locked -- target/editor/crucible.png --plugin crucible
           cargo run --manifest-path tools/editor-check/Cargo.toml --locked -- target/editor/lathe.png --plugin lathe
           cargo run --manifest-path tools/editor-check/Cargo.toml --locked -- target/editor/temper.png --plugin temper
+          cargo run --manifest-path tools/editor-check/Cargo.toml --locked -- target/editor/weld.png --plugin weld
       - uses: https://github.com/actions/upload-artifact@v3-node20
         with:
           name: editor-previews
@@ -89,6 +90,7 @@ jobs:
           python3 scripts/build-plugin.py --plugin crucible --target x86_64-pc-windows-gnu
           python3 scripts/build-plugin.py --plugin lathe --target x86_64-pc-windows-gnu
           python3 scripts/build-plugin.py --plugin temper --target x86_64-pc-windows-gnu
+          python3 scripts/build-plugin.py --plugin weld --target x86_64-pc-windows-gnu
           python3 scripts/package-windows.py
       - uses: https://github.com/actions/upload-artifact@v3-node20
         with:
diff --git a/.gitea/workflows/release.yml b/.gitea/workflows/release.yml
index a146bdc..e25073a 100644
--- a/.gitea/workflows/release.yml
+++ b/.gitea/workflows/release.yml
@@ -1,7 +1,7 @@
 name: Independent plugin release
 on:
   push:
-    tags: ["rivet-v*", "patina-v*", "anvil-v*", "crucible-v*", "lathe-v*", "temper-v*"]
+    tags: ["rivet-v*", "patina-v*", "anvil-v*", "crucible-v*", "lathe-v*", "temper-v*", "weld-v*"]
 
 permissions:
   contents: read
diff --git a/Cargo.lock b/Cargo.lock
index 1b78060..c8e6e9c 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -526,6 +526,23 @@ version = "0.9.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "0b928f33d975fc6ad9f86c8f283853ad26bdd5b10b7f1542aa2fa15e2289105a"
 
+[[package]]
+name = "weld-core"
+version = "0.1.0"
+dependencies = [
+ "serde",
+ "serde_json",
+]
+
+[[package]]
+name = "weld-ui"
+version = "0.1.0"
+dependencies = [
+ "common-ui",
+ "egui",
+ "weld-core",
+]
+
 [[package]]
 name = "windows-link"
 version = "0.2.1"
diff --git a/Cargo.toml b/Cargo.toml
index 1c04f28..7b1f391 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,7 +1,7 @@
 [workspace]
 resolver = "2"
-members = ["plugins/common/ui", "plugins/common/dsp", "plugins/anvil/core", "plugins/anvil/ui", "plugins/lathe/core", "plugins/lathe/ui", "plugins/temper/core", "plugins/temper/ui", "plugins/crucible/core", "plugins/crucible/ui", "plugins/rivet/core", "plugins/rivet/midi", "plugins/rivet/preview", "plugins/rivet/app", "plugins/patina/core", "plugins/patina/render", "plugins/patina/ui"]
-exclude = ["plugins/rivet/plugin", "tools/editor-check", "plugins/patina/plugin", "plugins/anvil/plugin", "plugins/crucible/plugin", "plugins/lathe/plugin", "plugins/temper/plugin"]
+members = ["plugins/common/ui", "plugins/common/dsp", "plugins/anvil/core", "plugins/anvil/ui", "plugins/lathe/core", "plugins/lathe/ui", "plugins/temper/core", "plugins/temper/ui", "plugins/weld/core", "plugins/weld/ui", "plugins/crucible/core", "plugins/crucible/ui", "plugins/rivet/core", "plugins/rivet/midi", "plugins/rivet/preview", "plugins/rivet/app", "plugins/patina/core", "plugins/patina/render", "plugins/patina/ui"]
+exclude = ["plugins/rivet/plugin", "tools/editor-check", "plugins/patina/plugin", "plugins/anvil/plugin", "plugins/crucible/plugin", "plugins/lathe/plugin", "plugins/temper/plugin", "plugins/weld/plugin"]
 
 [workspace.package]
 edition = "2021"
@@ -24,3 +24,5 @@ opt-level = 2
 opt-level = 2
 [profile.dev.package.temper-core]
 opt-level = 2
+[profile.dev.package.weld-core]
+opt-level = 2
diff --git a/docs/weld/CHANGELOG.md b/docs/weld/CHANGELOG.md
new file mode 100644
index 0000000..06e011d
--- /dev/null
+++ b/docs/weld/CHANGELOG.md
@@ -0,0 +1,7 @@
+# Weld changelog
+
+## Unreleased
+
+- Sidechain test build: stereo or mono main input with a matching sidechain
+  input, a sidechain level readout, Listen (Layer, Sum, Sum dry), Output and
+  Bypass. No phase alignment yet.
diff --git a/docs/weld/README.md b/docs/weld/README.md
new file mode 100644
index 0000000..c8f0e2e
--- /dev/null
+++ b/docs/weld/README.md
@@ -0,0 +1,32 @@
+# Weld
+
+Weld aligns the phase of one bass layer to another layer so the two sum
+instead of cancelling in the mids.
+
+> **Status: sidechain test build.** This build only checks that FL Studio
+> delivers a sidechain signal to Weld. It passes the main layer through
+> unchanged and shows the sidechain level. Phase alignment comes in the next
+> build.
+
+## Set up in FL Studio
+
+1. Load Weld on the mixer track of one layer (the main layer).
+2. On the mixer track of the other layer, right-click the route arrow to the
+   main layer's track and choose **Sidechain to this track**.
+3. In Weld's plugin wrapper, open the settings (gear icon) and, under the
+   processing or input routing options, set Weld's sidechain input to that
+   track.
+4. Play both layers. The large readout must show `sidechain: −NN dBFS`, and the
+   SIDECHAIN meter must move.
+
+## Controls
+
+- **Listen**:
+  - **Layer** outputs the main layer; use it in the mix.
+  - **Sum** outputs the main layer plus the sidechain layer. Mute the other
+    layer's own send to the master while you listen to Sum.
+  - **Sum dry** outputs the unprocessed sum, for comparison.
+- **Output**: output trim.
+- **Bypass**.
+
+Weld adds no latency.
diff --git a/plugins/catalog.json b/plugins/catalog.json
index d42b276..d00b722 100644
--- a/plugins/catalog.json
+++ b/plugins/catalog.json
@@ -98,5 +98,21 @@
       "temper-core",
       "temper-ui"
     ]
+  },
+  "weld": {
+    "name": "Weld",
+    "description": "Align the phase of a bass layer to a sidechain layer so the two sum instead of cancel",
+    "manifest": "plugins/weld/plugin/Cargo.toml",
+    "library": "weld",
+    "documentation": "docs/weld",
+    "clap_id": "io.storyboard.layer-align",
+    "licenses": {
+      "plugins/common/ui/assets/OFL.txt": "licenses/Roboto-OFL.txt"
+    },
+    "packages": [
+      "common-ui",
+      "weld-core",
+      "weld-ui"
+    ]
   }
 }
diff --git a/plugins/weld/core/Cargo.toml b/plugins/weld/core/Cargo.toml
new file mode 100644
index 0000000..bd047af
--- /dev/null
+++ b/plugins/weld/core/Cargo.toml
@@ -0,0 +1,16 @@
+[package]
+
+name = "weld-core"
+version = "0.1.0"
+edition.workspace = true
+license.workspace = true
+
+
+[dependencies]
+
+serde = { workspace = true }
+
+
+[dev-dependencies]
+
+serde_json = { workspace = true }
diff --git a/plugins/weld/core/src/lib.rs b/plugins/weld/core/src/lib.rs
new file mode 100644
index 0000000..c240a6e
--- /dev/null
+++ b/plugins/weld/core/src/lib.rs
@@ -0,0 +1,150 @@
+//! Weld engine: aligns the phase of the main layer to a sidechain layer so the two sum
+//! instead of cancel. Allocation-free after `new`; zero latency.
+mod settings;
+pub use settings::{Listen, Settings};
+
+/// Levels for the editor, published a few times per second.
+#[derive(Debug, Clone, Copy, PartialEq)]
+pub struct AnalyzerFrame {
+    /// RMS of the main input in dBFS since the last frame.
+    pub main_db: f32,
+    /// RMS of the sidechain input in dBFS since the last frame.
+    pub side_db: f32,
+    /// Peak of the sidechain input in dBFS since the last frame.
+    pub side_peak_db: f32,
+    /// True once any sidechain sample above −90 dBFS arrived since activation.
+    pub side_seen: bool,
+    pub sample_rate: f32,
+}
+impl Default for AnalyzerFrame {
+    fn default() -> Self {
+        Self {
+            main_db: -120.,
+            side_db: -120.,
+            side_peak_db: -120.,
+            side_seen: false,
+            sample_rate: 48000.,
+        }
+    }
+}
+
+fn db(power_or_amp: f32, power: bool) -> f32 {
+    let v = power_or_amp.max(1e-12);
+    if power {
+        10. * v.log10()
+    } else {
+        20. * v.log10()
+    }
+    .max(-120.)
+}
+
+#[derive(Default)]
+struct Levels {
+    main: f64,
+    side: f64,
+    peak: f32,
+    count: usize,
+}
+
+pub struct Engine {
+    rate: f32,
+    channels: usize,
+    settings: Settings,
+    gain: f32,
+    target_gain: f32,
+    gain_coef: f32,
+    fresh: bool,
+    levels: Levels,
+    side_seen: bool,
+}
+impl Engine {
+    pub fn new(rate: f32, channels: usize) -> Result<Self, &'static str> {
+        if !(rate.is_finite() && (8000.0..=768000.).contains(&rate)) {
+            return Err("unsupported sample rate");
+        }
+        if !(1..=2).contains(&channels) {
+            return Err("unsupported channel count");
+        }
+        Ok(Self {
+            rate,
+            channels,
+            settings: Settings::default(),
+            gain: 1.,
+            target_gain: 1.,
+            gain_coef: 1. - (-1. / (0.02 * rate)).exp(),
+            fresh: true,
+            levels: Levels::default(),
+            side_seen: false,
+        })
+    }
+    pub const fn latency_samples(&self) -> u32 {
+        0
+    }
+    pub fn channels(&self) -> usize {
+        self.channels
+    }
+    pub fn settings(&self) -> &Settings {
+        &self.settings
+    }
+    pub fn set_settings(&mut self, settings: Settings) -> Result<(), &'static str> {
+        settings.validate()?;
+        self.settings = settings;
+        self.target_gain = 10f32.powf(settings.output / 20.);
+        if self.fresh {
+            self.gain = self.target_gain;
+            self.fresh = false;
+        }
+        Ok(())
+    }
+    pub fn reset(&mut self) {
+        self.gain = self.target_gain;
+        self.levels = Levels::default();
+    }
+    /// One frame of main input `x` and sidechain input `side`. Mono uses index 0 only.
+    #[inline]
+    pub fn process_sample(&mut self, x: [f32; 2], side: [f32; 2]) -> [f32; 2] {
+        let n = self.channels;
+        let (mut m, mut s) = (0f32, 0f32);
+        for c in 0..n {
+            m += x[c];
+            s += side[c];
+            self.levels.peak = self.levels.peak.max(side[c].abs());
+        }
+        m /= n as f32;
+        s /= n as f32;
+        self.levels.main += (m * m) as f64;
+        self.levels.side += (s * s) as f64;
+        self.levels.count += 1;
+        if s.abs() > 3e-5 {
+            self.side_seen = true;
+        }
+        self.gain += (self.target_gain - self.gain) * self.gain_coef;
+        if self.settings.bypass {
+            return x;
+        }
+        let mut out = [0.; 2];
+        for c in 0..n {
+            let layer = x[c];
+            out[c] = self.gain
+                * match self.settings.listen {
+                    Listen::Layer => layer,
+                    Listen::Sum => layer + side[c],
+                    Listen::SumDry => x[c] + side[c],
+                };
+        }
+        out
+    }
+    /// Levels since the previous call.
+    pub fn take_analyzer(&mut self) -> AnalyzerFrame {
+        let n = self.levels.count.max(1) as f64;
+        let frame = AnalyzerFrame {
+            main_db: db((self.levels.main / n) as f32, true),
+            side_db: db((self.levels.side / n) as f32, true),
+            side_peak_db: db(self.levels.peak, false),
+            side_seen: self.side_seen,
+            sample_rate: self.rate,
+        };
+        self.levels = Levels::default();
+        frame
+    }
+}
diff --git a/plugins/weld/core/src/settings.rs b/plugins/weld/core/src/settings.rs
new file mode 100644
index 0000000..c229c31
--- /dev/null
+++ b/plugins/weld/core/src/settings.rs
@@ -0,0 +1,43 @@
+//! Host-independent controls. Gains in dB.
+use serde::{Deserialize, Serialize};
+
+/// What the plugin outputs.
+#[derive(Debug, Clone, Copy, Serialize, Deserialize, PartialEq, Eq, Default)]
+pub enum Listen {
+    /// The aligned main layer only. The sidechain layer reaches the mix on its own track.
+    #[default]
+    Layer,
+    /// Aligned main layer plus the sidechain layer, to judge the sum in one place.
+    Sum,
+    /// Unprocessed main layer plus the sidechain layer, to compare with `Sum`.
+    SumDry,
+}
+
+#[derive(Debug, Clone, Copy, Serialize, Deserialize, PartialEq)]
+#[serde(deny_unknown_fields)]
+pub struct Settings {
+    pub listen: Listen,
+    pub output: f32,
+    pub bypass: bool,
+}
+impl Default for Settings {
+    fn default() -> Self {
+        Self {
+            listen: Listen::Layer,
+            output: 0.,
+            bypass: false,
+        }
+    }
+}
+impl Settings {
+    pub fn validate(&self) -> Result<(), &'static str> {
+        if !self.output.is_finite() {
+            return Err("non-finite setting");
+        }
+        if (-12.0..=12.).contains(&self.output) {
+            Ok(())
+        } else {
+            Err("setting out of range")
+        }
+    }
+}
diff --git a/plugins/weld/core/tests/dsp.rs b/plugins/weld/core/tests/dsp.rs
new file mode 100644
index 0000000..e71d936
--- /dev/null
+++ b/plugins/weld/core/tests/dsp.rs
@@ -0,0 +1,97 @@
+use weld_core::{Engine, Listen, Settings};
+
+fn signal(n: usize, hz: f32) -> f32 {
+    (std::f32::consts::TAU * hz * n as f32 / 48000.).sin() * 0.5
+}
+
+#[test]
+fn layer_output_is_the_main_input_with_zero_latency() {
+    let mut engine = Engine::new(48000., 2).unwrap();
+    engine.set_settings(Settings::default()).unwrap();
+    assert_eq!(engine.latency_samples(), 0);
+    for n in 0..4800 {
+        let x = [signal(n, 110.), -signal(n, 220.)];
+        let out = engine.process_sample(x, [signal(n, 330.), 0.25]);
+        assert_eq!(out, x);
+    }
+}
+
+#[test]
+fn sum_modes_add_the_sidechain() {
+    for listen in [Listen::Sum, Listen::SumDry] {
+        let mut engine = Engine::new(48000., 2).unwrap();
+        engine
+            .set_settings(Settings {
+                listen,
+                ..Settings::default()
+            })
+            .unwrap();
+        for n in 0..480 {
+            let x = [signal(n, 110.), signal(n, 120.)];
+            let s = [signal(n, 330.), -signal(n, 90.)];
+            let out = engine.process_sample(x, s);
+            for c in 0..2 {
+                assert!((out[c] - (x[c] + s[c])).abs() < 1e-6);
+            }
+        }
+    }
+}
+
+#[test]
+fn mono_bypass_and_output_gain() {
+    let mut engine = Engine::new(44100., 1).unwrap();
+    engine
+        .set_settings(Settings {
+            output: -6.,
+            ..Settings::default()
+        })
+        .unwrap();
+    let out = engine.process_sample([0.5, 0.], [0., 0.]);
+    assert!((out[0] - 0.5 * 10f32.powf(-6. / 20.)).abs() < 1e-6);
+    assert_eq!(out[1], 0.);
+    engine
+        .set_settings(Settings {
+            bypass: true,
+            ..Settings::default()
+        })
+        .unwrap();
+    assert_eq!(engine.process_sample([0.3, 0.], [0.9, 0.]), [0.3, 0.]);
+}
+
+#[test]
+fn analyzer_reports_sidechain_presence_and_level() {
+    let mut engine = Engine::new(48000., 2).unwrap();
+    engine.set_settings(Settings::default()).unwrap();
+    for n in 0..4800 {
+        engine.process_sample([signal(n, 100.); 2], [0.; 2]);
+    }
+    let frame = engine.take_analyzer();
+    assert!(!frame.side_seen);
+    assert!(frame.side_db < -100.);
+    assert!((frame.main_db - (-9.03)).abs() < 0.1, "{}", frame.main_db);
+    for n in 0..4800 {
+        engine.process_sample([0.; 2], [signal(n, 100.); 2]);
+    }
+    let frame = engine.take_analyzer();
+    assert!(frame.side_seen);
+    assert!((frame.side_db - (-9.03)).abs() < 0.1);
+    assert!((frame.side_peak_db - (-6.02)).abs() < 0.1);
+}
+
+#[test]
+fn invalid_settings_and_rates_are_rejected() {
+    assert!(Engine::new(0., 2).is_err());
+    assert!(Engine::new(48000., 3).is_err());
+    let mut engine = Engine::new(48000., 2).unwrap();
+    assert!(engine
+        .set_settings(Settings {
+            output: f32::NAN,
+            ..Settings::default()
+        })
+        .is_err());
+    let json = serde_json::to_string(&Settings::default()).unwrap();
+    assert_eq!(
+        serde_json::from_str::<Settings>(&json).unwrap(),
+        Settings::default()
+    );
+}
diff --git a/plugins/weld/plugin/Cargo.lock b/plugins/weld/plugin/Cargo.lock
new file mode 100644
index 0000000..6f45f9c
--- /dev/null
+++ b/plugins/weld/plugin/Cargo.lock
@@ -0,0 +1,2375 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 4
+
+[[package]]
+name = "ab_glyph"
+version = "0.2.32"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "01c0457472c38ea5bd1c3b5ada5e368271cb550be7a4ca4a0b4634e9913f6cc2"
+dependencies = [
+ "ab_glyph_rasterizer",
+ "owned_ttf_parser",
+]
+
+[[package]]
+name = "ab_glyph_rasterizer"
+version = "0.1.10"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "366ffbaa4442f4684d91e2cd7c5ea7c4ed8add41959a31447066e279e432b618"
+
+[[package]]
+name = "addr2line"
+version = "0.27.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e567177890eb1617b1f774005b66b26b2377afd138a2ca37aae7d8f0c81429d4"
+dependencies = [
+ "gimli",
+]
+
+[[package]]
+name = "adler2"
+version = "2.0.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "320119579fcad9c21884f5c4861d16174d0e06250625266f50fe6898340abefa"
+
+[[package]]
+name = "ahash"
+version = "0.8.12"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5a15f179cd60c4584b8a8c596927aadc462e27f2ca70c04e0071964a73ba7a75"
+dependencies = [
+ "cfg-if",
+ "once_cell",
+ "version_check",
+ "zerocopy",
+]
+
+[[package]]
+name = "android-activity"
+version = "0.6.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0f2a1bb052857d5dd49572219344a7332b31b76405648eabac5bc68978251bcd"
+dependencies = [
+ "android-properties",
+ "bitflags 2.13.2",
+ "cc",
+ "jni",
+ "libc",
+ "log",
+ "ndk",
+ "ndk-context",
+ "ndk-sys",
+ "num_enum",
+ "thiserror 2.0.21",
+]
+
+[[package]]
+name = "android-properties"
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diff --git a/plugins/weld/plugin/Cargo.toml b/plugins/weld/plugin/Cargo.toml
new file mode 100644
index 0000000..9d3f0d5
--- /dev/null
+++ b/plugins/weld/plugin/Cargo.toml
@@ -0,0 +1,25 @@
+[package]
+name = "weld"
+version = "0.1.0"
+edition = "2021"
+license = "ISC"
+
+[workspace]
+
+[lib]
+crate-type = ["cdylib", "rlib"]
+
+[dependencies]
+nih_plug = { git = "https://github.com/robbert-vdh/nih-plug.git", rev = "de421011f41a6d10fc8c7a6084e4f4dee0143683", default-features = false }
+nih_plug_egui = { git = "https://github.com/robbert-vdh/nih-plug.git", rev = "de421011f41a6d10fc8c7a6084e4f4dee0143683" }
+weld-core = { path = "../core" }
+weld-ui = { path = "../ui" }
+crossbeam-queue = "0.3"
+
+[dev-dependencies]
+clap-sys = { git = "https://github.com/micahrj/clap-sys.git", rev = "25d7f53fdb6363ad63fbd80049cb7a42a97ac156" }
+serde_json = "1"
+
+[profile.release]
+lto = "thin"
+strip = "symbols"
diff --git a/plugins/weld/plugin/src/lib.rs b/plugins/weld/plugin/src/lib.rs
new file mode 100644
index 0000000..dc098f7
--- /dev/null
+++ b/plugins/weld/plugin/src/lib.rs
@@ -0,0 +1,179 @@
+//! CLAP audio effect with a sidechain input. All DSP state is owned by the processing thread.
+mod params;
+use crossbeam_queue::ArrayQueue;
+use nih_plug::prelude::*;
+use nih_plug_egui::{create_egui_editor, egui};
+use params::WeldParams;
+use std::sync::Arc;
+use weld_core::{AnalyzerFrame, Engine};
+
+struct EditorData {
+    ui: weld_ui::State,
+    gestures: [bool; 1],
+}
+pub struct Weld {
+    params: Arc<WeldParams>,
+    analyzer: Arc<ArrayQueue<AnalyzerFrame>>,
+    engine: Option<Engine>,
+    publish_count: usize,
+    publish_interval: usize,
+}
+impl Default for Weld {
+    fn default() -> Self {
+        Self {
+            params: Arc::new(WeldParams::default()),
+            analyzer: Arc::new(ArrayQueue::new(2)),
+            engine: None,
+            publish_count: 0,
+            publish_interval: 1600,
+        }
+    }
+}
+impl Plugin for Weld {
+    const NAME: &'static str = "Weld";
+    const VENDOR: &'static str = "Rivet & Patina";
+    const URL: &'static str = "";
+    const EMAIL: &'static str = "";
+    const VERSION: &'static str = env!("CARGO_PKG_VERSION");
+    const AUDIO_IO_LAYOUTS: &'static [AudioIOLayout] = &[
+        AudioIOLayout {
+            main_input_channels: NonZeroU32::new(2),
+            main_output_channels: NonZeroU32::new(2),
+            aux_input_ports: &[new_nonzero_u32(2)],
+            ..AudioIOLayout::const_default()
+        },
+        AudioIOLayout {
+            main_input_channels: NonZeroU32::new(1),
+            main_output_channels: NonZeroU32::new(1),
+            aux_input_ports: &[new_nonzero_u32(1)],
+            ..AudioIOLayout::const_default()
+        },
+    ];
+    const SAMPLE_ACCURATE_AUTOMATION: bool = false;
+    type SysExMessage = ();
+    type BackgroundTask = ();
+    fn params(&self) -> Arc<dyn Params> {
+        self.params.clone()
+    }
+    fn editor(&mut self, _: AsyncExecutor<Self>) -> Option<Box<dyn Editor>> {
+        let params = self.params.clone();
+        let analyzer = self.analyzer.clone();
+        create_egui_editor(
+            params.editor.clone(),
+            EditorData {
+                ui: weld_ui::State::default(),
+                gestures: [false; 1],
+            },
+            |ctx, _| weld_ui::style(ctx),
+            move |ctx, setter, data| {
+                while let Some(frame) = analyzer.pop() {
+                    data.ui.accept_frame(frame);
+                }
+                let before = params.settings();
+                let mut edited = before;
+                nih_plug_egui::resizable_window::ResizableWindow::new("weld-editor")
+                    .min_size(egui::vec2(
+                        weld_ui::WIDTH as f32 - 80.,
+                        weld_ui::HEIGHT as f32 - 40.,
+                    ))
+                    .show(ctx, &params.editor, |ui| {
+                        weld_ui::show(ui, &mut edited, &mut data.ui)
+                    });
+                params.apply(
+                    setter,
+                    &before,
+                    &edited,
+                    data.ui.gesture_active,
+                    &mut data.gestures,
+                );
+                // Meters follow the audio.
+                ctx.request_repaint_after(std::time::Duration::from_millis(40));
+            },
+        )
+    }
+    fn initialize(
+        &mut self,
+        layout: &AudioIOLayout,
+        config: &BufferConfig,
+        context: &mut impl InitContext<Self>,
+    ) -> bool {
+        let Ok(mut engine) = Engine::new(
+            config.sample_rate,
+            layout.main_input_channels.map_or(0, |v| v.get() as usize),
+        ) else {
+            return false;
+        };
+        if engine.set_settings(self.params.settings()).is_err() {
+            return false;
+        }
+        context.set_latency_samples(engine.latency_samples());
+        self.publish_interval = (config.sample_rate / 30.) as usize;
+        self.engine = Some(engine);
+        true
+    }
+    fn reset(&mut self) {
+        if let Some(e) = self.engine.as_mut() {
+            e.reset();
+        }
+        self.publish_count = 0;
+    }
+    fn process(
+        &mut self,
+        buffer: &mut Buffer,
+        aux: &mut AuxiliaryBuffers,
+        _: &mut impl ProcessContext<Self>,
+    ) -> ProcessStatus {
+        let Some(engine) = self.engine.as_mut() else {
+            return ProcessStatus::Normal;
+        };
+        let _ = engine.set_settings(self.params.settings());
+        // A host that does not connect the sidechain still passes a buffer; treat a
+        // missing one as silence.
+        let side = aux.inputs.first().map(|b| b.as_slice_immutable());
+        let stereo = engine.channels() == 2;
+        for (index, mut sample) in buffer.iter_samples().enumerate() {
+            let x = [
+                *sample.get_mut(0).unwrap(),
+                if stereo {
+                    *sample.get_mut(1).unwrap()
+                } else {
+                    0.
+                },
+            ];
+            let mut s = [0f32; 2];
+            if let Some(side) = side {
+                for (c, value) in s.iter_mut().enumerate().take(side.len().min(2)) {
+                    *value = side[c].get(index).copied().unwrap_or(0.);
+                }
+                if !stereo && side.len() > 1 {
+                    s[0] = 0.5 * (s[0] + s[1]);
+                }
+            }
+            let out = engine.process_sample(x, s);
+            for (c, value) in sample.into_iter().enumerate() {
+                *value = out[c];
+            }
+            self.publish_count += 1;
+            if self.publish_count >= self.publish_interval {
+                self.analyzer.force_push(engine.take_analyzer());
+                self.publish_count = 0;
+            }
+        }
+        ProcessStatus::Normal
+    }
+}
+impl ClapPlugin for Weld {
+    const CLAP_ID: &'static str = "io.storyboard.layer-align";
+    const CLAP_DESCRIPTION: Option<&'static str> = Some(
+        "Align the phase of a bass layer to a sidechain layer so the two sum instead of cancel",
+    );
+    const CLAP_MANUAL_URL: Option<&'static str> = None;
+    const CLAP_SUPPORT_URL: Option<&'static str> = None;
+    const CLAP_FEATURES: &'static [ClapFeature] = &[
+        ClapFeature::AudioEffect,
+        ClapFeature::Utility,
+        ClapFeature::Stereo,
+        ClapFeature::Mono,
+    ];
+}
+nih_export_clap!(Weld);
diff --git a/plugins/weld/plugin/src/params.rs b/plugins/weld/plugin/src/params.rs
new file mode 100644
index 0000000..899c3d1
--- /dev/null
+++ b/plugins/weld/plugin/src/params.rs
@@ -0,0 +1,104 @@
+use nih_plug::prelude::*;
+use nih_plug_egui::EguiState;
+use std::sync::Arc;
+use weld_core::{Listen, Settings};
+
+#[derive(Enum, Debug, PartialEq, Eq, Clone, Copy)]
+pub enum ListenParam {
+    #[id = "layer"]
+    Layer,
+    #[id = "sum"]
+    Sum,
+    #[id = "sum-dry"]
+    #[name = "Sum dry"]
+    SumDry,
+}
+/// Continuous controls, in the order of the gesture slots.
+const FLOATS: usize = 1;
+
+#[derive(Params)]
+pub struct WeldParams {
+    #[persist = "editor"]
+    pub editor: Arc<EguiState>,
+    #[id = "listen"]
+    pub listen: EnumParam<ListenParam>,
+    #[id = "output"]
+    pub output: FloatParam,
+    #[id = "bypass"]
+    pub bypass: BoolParam,
+}
+impl Default for WeldParams {
+    fn default() -> Self {
+        let d = Settings::default();
+        Self {
+            editor: EguiState::from_size(weld_ui::WIDTH, weld_ui::HEIGHT),
+            listen: EnumParam::new("Listen", ListenParam::Layer),
+            output: FloatParam::new(
+                "Output",
+                d.output,
+                FloatRange::Linear {
+                    min: -12.,
+                    max: 12.,
+                },
+            )
+            .with_unit(" dB"),
+            bypass: BoolParam::new("Bypass", false).make_bypass(),
+        }
+    }
+}
+impl WeldParams {
+    pub fn settings(&self) -> Settings {
+        Settings {
+            listen: match self.listen.value() {
+                ListenParam::Layer => Listen::Layer,
+                ListenParam::Sum => Listen::Sum,
+                ListenParam::SumDry => Listen::SumDry,
+            },
+            output: self.output.value(),
+            bypass: self.bypass.value(),
+        }
+    }
+    fn floats(&self) -> [&FloatParam; FLOATS] {
+        [&self.output]
+    }
+    /// Pushes every changed editor value to the host. Continuous controls hold one gesture
+    /// while the pointer is down; switches are set in a single gesture.
+    pub fn apply(
+        &self,
+        setter: &ParamSetter,
+        old: &Settings,
+        new: &Settings,
+        dragging: bool,
+        open: &mut [bool; FLOATS],
+    ) {
+        let values = [(old.output, new.output)];
+        for (i, (p, (a, b))) in self.floats().into_iter().zip(values).enumerate() {
+            if a != b {
+                if !open[i] {
+                    open[i] = true;
+                    setter.begin_set_parameter(p);
+                }
+                setter.set_parameter(p, b);
+            }
+            if !dragging && open[i] {
+                setter.end_set_parameter(p);
+                open[i] = false;
+            }
+        }
+        if new.bypass != old.bypass {
+            setter.begin_set_parameter(&self.bypass);
+            setter.set_parameter(&self.bypass, new.bypass);
+            setter.end_set_parameter(&self.bypass);
+        }
+        if new.listen != old.listen {
+            let v = match new.listen {
+                Listen::Layer => ListenParam::Layer,
+                Listen::Sum => ListenParam::Sum,
+                Listen::SumDry => ListenParam::SumDry,
+            };
+            setter.begin_set_parameter(&self.listen);
+            setter.set_parameter(&self.listen, v);
+            setter.end_set_parameter(&self.listen);
+        }
+    }
+}
diff --git a/plugins/weld/plugin/tests/host.rs b/plugins/weld/plugin/tests/host.rs
new file mode 100644
index 0000000..214d2ec
--- /dev/null
+++ b/plugins/weld/plugin/tests/host.rs
@@ -0,0 +1,226 @@
+//! Exercise the actual exported CLAP ABI without requiring a GUI or installed DAW.
+use clap_sys::{
+    audio_buffer::*,
+    events::*,
+    ext::{audio_ports::*, latency::*, state::*},
+    factory::plugin_factory::*,
+    host::*,
+    process::*,
+    stream::*,
+    version::*,
+};
+use std::{
+    ffi::{c_char, c_void, CStr},
+    io::{Cursor, Read},
+    ptr,
+};
+
+unsafe extern "C" fn extension(_: *const clap_host, _: *const c_char) -> *const c_void {
+    ptr::null()
+}
+unsafe extern "C" fn request(_: *const clap_host) {}
+unsafe extern "C" fn count(_: *const clap_input_events) -> u32 {
+    0
+}
+unsafe extern "C" fn event(_: *const clap_input_events, _: u32) -> *const clap_event_header {
+    ptr::null()
+}
+unsafe extern "C" fn push(_: *const clap_output_events, _: *const clap_event_header) -> bool {
+    true
+}
+unsafe extern "C" fn write(stream: *const clap_ostream, buffer: *const c_void, size: u64) -> i64 {
+    // SAFETY: The test owns the Vec for the entire synchronous save call.
+    let bytes = unsafe { &mut *((*stream).ctx as *mut Vec<u8>) };
+    bytes.extend_from_slice(unsafe {
+        std::slice::from_raw_parts(buffer as *const u8, size as usize)
+    });
+    size as i64
+}
+unsafe extern "C" fn read(stream: *const clap_istream, buffer: *mut c_void, size: u64) -> i64 {
+    // SAFETY: The test owns the Cursor; the wrapper supplies writable stream storage.
+    let cursor = unsafe { &mut *((*stream).ctx as *mut Cursor<Vec<u8>>) };
+    cursor
+        .read(unsafe { std::slice::from_raw_parts_mut(buffer as *mut u8, size as usize) })
+        .unwrap() as i64
+}
+
+#[test]
+fn sidechain_port_state_latency_and_audio_lifecycle() {
+    // SAFETY: All callbacks, strings, streams, buffers, and the host outlive their
+    // synchronous ABI calls. Activation/processing/destruction follow CLAP order.
+    unsafe {
+        let entry = &weld::clap_entry;
+        assert!(entry.init.unwrap()(c"weld.clap".as_ptr()));
+        let factory = entry.get_factory.unwrap()(CLAP_PLUGIN_FACTORY_ID.as_ptr())
+            as *const clap_plugin_factory;
+        assert!(!factory.is_null());
+        let factory = &*factory;
+        assert_eq!(factory.get_plugin_count.unwrap()(factory), 1);
+        let descriptor = factory.get_plugin_descriptor.unwrap()(factory, 0);
+        assert!(!descriptor.is_null());
+        assert_eq!(CStr::from_ptr((*descriptor).name), c"Weld");
+        assert_eq!(
+            CStr::from_ptr((*descriptor).id),
+            c"io.storyboard.layer-align"
+        );
+        let host = clap_host {
+            clap_version: CLAP_VERSION,
+            host_data: ptr::null_mut(),
+            name: c"Storyboard test host".as_ptr(),
+            vendor: c"Tests".as_ptr(),
+            url: c"".as_ptr(),
+            version: c"1.0".as_ptr(),
+            get_extension: Some(extension),
+            request_restart: Some(request),
+            request_process: Some(request),
+            request_callback: Some(request),
+        };
+        let plugin = factory.create_plugin.unwrap()(factory, &host, (*descriptor).id);
+        assert!(!plugin.is_null());
+        let p = &*plugin;
+        assert!(p.init.unwrap()(plugin));
+        let ports = p.get_extension.unwrap()(plugin, CLAP_EXT_AUDIO_PORTS.as_ptr())
+            as *const clap_plugin_audio_ports;
+        assert!(!ports.is_null());
+        // Main input plus the sidechain input; one output.
+        assert_eq!((*ports).count.unwrap()(plugin, true), 2);
+        assert_eq!((*ports).count.unwrap()(plugin, false), 1);
+        let mut info: clap_audio_port_info = std::mem::zeroed();
+        assert!((*ports).get.unwrap()(plugin, 1, true, &mut info));
+        assert_eq!(info.channel_count, 2);
+        assert_eq!(info.flags & CLAP_AUDIO_PORT_IS_MAIN, 0);
+        let latency = p.get_extension.unwrap()(plugin, CLAP_EXT_LATENCY.as_ptr())
+            as *const clap_plugin_latency;
+        assert!(!latency.is_null());
+        let state =
+            p.get_extension.unwrap()(plugin, CLAP_EXT_STATE.as_ptr()) as *const clap_plugin_state;
+        assert!(!state.is_null());
+        let state = &*state;
+        let save = || {
+            let mut bytes = Vec::new();
+            let stream = clap_ostream {
+                ctx: &mut bytes as *mut Vec<u8> as *mut c_void,
+                write: Some(write),
+            };
+            assert!(state.save.unwrap()(plugin, &stream));
+            bytes
+        };
+        let mut envelope: nih_plug::prelude::PluginState =
+            serde_json::from_slice(&save()[8..]).unwrap();
+        use nih_plug::wrapper::state::ParamValue;
+        envelope
+            .params
+            .insert("listen".into(), ParamValue::String("sum".into()));
+        let encoded = serde_json::to_vec(&envelope).unwrap();
+        let mut framed = (encoded.len() as u64).to_le_bytes().to_vec();
+        framed.extend_from_slice(&encoded);
+        let mut bytes = Cursor::new(framed);
+        let stream = clap_istream {
+            ctx: &mut bytes as *mut Cursor<Vec<u8>> as *mut c_void,
+            read: Some(read),
+        };
+        assert!(state.load.unwrap()(plugin, &stream));
+        let restored: nih_plug::prelude::PluginState =
+            serde_json::from_slice(&save()[8..]).unwrap();
+        assert_eq!(
+            serde_json::to_value(&restored.params).unwrap(),
+            serde_json::to_value(&envelope.params).unwrap()
+        );
+        // Listen = Sum: a sidechain equal to the main input doubles the output (+6 dB).
+        // A silent sidechain leaves the main input alone. CLAP hosts pass every port, so
+        // the test always passes both (nih_plug reads one port past a short count).
+        for (rate, with_side, expected_db) in [
+            (44100., true, 6.02),
+            (48000., false, 0.),
+            (96000., true, 6.02),
+        ] {
+            assert!(p.activate.unwrap()(plugin, rate, 1, 512));
+            assert_eq!((*latency).get.unwrap()(plugin), 0);
+            assert!(p.start_processing.unwrap()(plugin));
+            let total = 9600;
+            let mut position = 0;
+            let (mut energy_in, mut energy_out) = (0f64, 0f64);
+            while position < total {
+                let frames = [1, 127, 512, 31][position % 4].min(total - position);
+                let tone = |n: usize| {
+                    0.25 * (std::f64::consts::TAU * 1000. * n as f64 / rate).sin() as f32
+                };
+                let mut input_left = [0f32; 512];
+                let mut input_right = [0f32; 512];
+                for i in 0..frames {
+                    input_left[i] = tone(position + i);
+                    input_right[i] = -tone(position + i);
+                }
+                let (mut side_left, mut side_right) = if with_side {
+                    (input_left, input_right)
+                } else {
+                    ([0f32; 512], [0f32; 512])
+                };
+                let mut left = [0f32; 512];
+                let mut right = [0f32; 512];
+                let mut in_channels = [input_left.as_mut_ptr(), input_right.as_mut_ptr()];
+                let mut side_channels = [side_left.as_mut_ptr(), side_right.as_mut_ptr()];
+                let mut out_channels = [left.as_mut_ptr(), right.as_mut_ptr()];
+                let incoming = [
+                    clap_audio_buffer {
+                        data32: in_channels.as_mut_ptr(),
+                        data64: ptr::null_mut(),
+                        channel_count: 2,
+                        latency: 0,
+                        constant_mask: 0,
+                    },
+                    clap_audio_buffer {
+                        data32: side_channels.as_mut_ptr(),
+                        data64: ptr::null_mut(),
+                        channel_count: 2,
+                        latency: 0,
+                        constant_mask: 0,
+                    },
+                ];
+                let mut outgoing_audio = clap_audio_buffer {
+                    data32: out_channels.as_mut_ptr(),
+                    data64: ptr::null_mut(),
+                    channel_count: 2,
+                    latency: 0,
+                    constant_mask: 0,
+                };
+                let input = clap_input_events {
+                    ctx: ptr::null_mut(),
+                    size: Some(count),
+                    get: Some(event),
+                };
+                let outgoing = clap_output_events {
+                    ctx: ptr::null_mut(),
+                    try_push: Some(push),
+                };
+                let process = clap_process {
+                    steady_time: position as i64,
+                    frames_count: frames as u32,
+                    transport: ptr::null(),
+                    audio_inputs: incoming.as_ptr(),
+                    audio_outputs: &mut outgoing_audio,
+                    audio_inputs_count: 2,
+                    audio_outputs_count: 1,
+                    in_events: &input,
+                    out_events: &outgoing,
+                };
+                assert_ne!(p.process.unwrap()(plugin, &process), CLAP_PROCESS_ERROR);
+                for i in 0..frames {
+                    let n = position + i;
+                    energy_in += 2. * (tone(n) as f64).powi(2);
+                    energy_out += (left[i] as f64).powi(2) + (right[i] as f64).powi(2);
+                }
+                position += frames;
+            }
+            let ratio_db = 10. * (energy_out / energy_in).log10();
+            assert!(
+                (ratio_db - expected_db).abs() < 0.2,
+                "{rate} {with_side} {ratio_db}"
+            );
+            p.stop_processing.unwrap()(plugin);
+            p.deactivate.unwrap()(plugin);
+        }
+        p.destroy.unwrap()(plugin);
+        entry.deinit.unwrap()();
+    }
+}
diff --git a/plugins/weld/ui/Cargo.toml b/plugins/weld/ui/Cargo.toml
new file mode 100644
index 0000000..c36ed76
--- /dev/null
+++ b/plugins/weld/ui/Cargo.toml
@@ -0,0 +1,13 @@
+[package]
+
+name = "weld-ui"
+version = "0.1.0"
+edition.workspace = true
+license.workspace = true
+
+
+[dependencies]
+
+egui = "0.31.1"
+weld-core = { path = "../core" }
+common-ui = { path = "../../common/ui" }
diff --git a/plugins/weld/ui/src/lib.rs b/plugins/weld/ui/src/lib.rs
new file mode 100644
index 0000000..271c527
--- /dev/null
+++ b/plugins/weld/ui/src/lib.rs
@@ -0,0 +1,115 @@
+//! Weld editor, shared by the CLAP wrapper and the headless renderer.
+use common_ui::*;
+use egui::{self, FontId, RichText};
+use weld_core::{AnalyzerFrame, Listen, Settings};
+
+pub use common_ui::style;
+pub const WIDTH: u32 = 1040;
+pub const HEIGHT: u32 = 650;
+
+pub struct State {
+    pub analyzer: AnalyzerFrame,
+    /// True while a pointer button is held, so knob drags become one host gesture.
+    pub gesture_active: bool,
+    pub help: String,
+}
+impl Default for State {
+    fn default() -> Self {
+        Self {
+            analyzer: AnalyzerFrame::default(),
+            gesture_active: false,
+            help: DEFAULT_HELP.into(),
+        }
+    }
+}
+const DEFAULT_HELP: &str =
+    "Put Weld on one bass layer and send the other layer to its sidechain input.";
+impl State {
+    pub fn accept_frame(&mut self, frame: AnalyzerFrame) {
+        let old = self.analyzer;
+        self.analyzer = frame;
+        // Meters fall smoothly between frames.
+        self.analyzer.main_db = frame.main_db.max(old.main_db - 3.);
+        self.analyzer.side_db = frame.side_db.max(old.side_db - 3.);
+        self.analyzer.side_peak_db = frame.side_peak_db.max(old.side_peak_db - 3.);
+    }
+}
+fn hint(r: &egui::Response, state: &mut State, text: &str) {
+    if r.hovered() || r.has_focus() {
+        state.help = text.into();
+    }
+}
+
+pub fn show(ui: &mut egui::Ui, settings: &mut Settings, state: &mut State) {
+    backdrop(ui);
+    state.help = DEFAULT_HELP.into();
+    state.gesture_active = ui.input(|i| i.pointer.any_down());
+    ui.add_space(2.);
+    header(ui, "WELD", "LAYER ALIGN", |ui| {
+        let r = ui
+            .selectable_label(settings.bypass, RichText::new("BYPASS").size(13.))
+            .on_hover_text("Pass the main layer through unchanged.");
+        if r.clicked() {
+            settings.bypass = !settings.bypass;
+        }
+    });
+    ui.add_space(6.);
+    let frame = state.analyzer;
+    panel(ui, |ui| {
+        ui.set_width(ui.available_width());
+        ui.set_min_height(380.);
+        ui.vertical(|ui| {
+            caption(ui, "SIDECHAIN");
+            let (text, color) = if frame.side_db > -90. {
+                (format!("sidechain: {:.0} dBFS", frame.side_db), TEXT)
+            } else if frame.side_seen {
+                ("sidechain: silent".to_string(), MUTED)
+            } else {
+                ("no sidechain signal".to_string(), DIM)
+            };
+            ui.label(
+                RichText::new(text)
+                    .font(FontId::new(40., egui::FontFamily::Name("medium".into())))
+                    .color(color),
+            );
+            ui.add_space(12.);
+            meter(ui, "MAIN", frame.main_db, STEEL, 520.);
+            meter(ui, "SIDECHAIN", frame.side_db, ACCENT, 520.);
+            meter(ui, "SIDE PEAK", frame.side_peak_db, FOCUS, 520.);
+            ui.add_space(18.);
+            ui.label(
+                RichText::new(
+                    "FL Studio: on the other layer's mixer track, right-click the route arrow \
+                     to this track and choose \"Sidechain to this track\". Then open Weld's \
+                     wrapper settings and set the sidechain input to that track.",
+                )
+                .size(13.)
+                .color(MUTED),
+            );
+        });
+    });
+    ui.add_space(6.);
+    panel(ui, |ui| {
+        ui.set_width(ui.available_width());
+        ui.horizontal(|ui| {
+            caption(ui, "LISTEN");
+            for (listen, label, help) in [
+                (Listen::Layer, "LAYER", "Output the main layer only. Use this in the mix."),
+                (Listen::Sum, "SUM", "Output main + sidechain layer. Mute the other layer's own send while listening."),
+                (Listen::SumDry, "SUM DRY", "Output the unprocessed main + sidechain layer, to compare with SUM."),
+            ] {
+                let r = ui.selectable_label(settings.listen == listen, RichText::new(label).size(13.));
+                if r.clicked() {
+                    settings.listen = listen;
+                }
+                hint(&r, state, help);
+            }
+            ui.add_space(40.);
+            let d = Settings::default();
+            let r = rotary(ui, "Output", &mut settings.output, -12. ..=12., d.output, " dB", 54., ACCENT);
+            hint(&r, state, "Output trim.");
+        });
+    });
+    ui.separator();
+    ui.label(RichText::new(&state.help).color(MUTED));
+}
diff --git a/tools/editor-check/Cargo.lock b/tools/editor-check/Cargo.lock
index ca570db..35838ae 100644
--- a/tools/editor-check/Cargo.lock
+++ b/tools/editor-check/Cargo.lock
@@ -167,6 +167,8 @@ dependencies = [
  "rivet-midi",
  "temper-core",
  "temper-ui",
+ "weld-core",
+ "weld-ui",
 ]
 
 [[package]]
@@ -642,6 +644,22 @@ version = "0.9.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "0b928f33d975fc6ad9f86c8f283853ad26bdd5b10b7f1542aa2fa15e2289105a"
 
+[[package]]
+name = "weld-core"
+version = "0.1.0"
+dependencies = [
+ "serde",
+]
+
+[[package]]
+name = "weld-ui"
+version = "0.1.0"
+dependencies = [
+ "common-ui",
+ "egui",
+ "weld-core",
+]
+
 [[package]]
 name = "windows-link"
 version = "0.2.1"
diff --git a/tools/editor-check/Cargo.toml b/tools/editor-check/Cargo.toml
index fb9cc68..64b0127 100644
--- a/tools/editor-check/Cargo.toml
+++ b/tools/editor-check/Cargo.toml
@@ -23,3 +23,5 @@ lathe-core = { path = "../../plugins/lathe/core" }
 lathe-ui = { path = "../../plugins/lathe/ui" }
 temper-core = { path = "../../plugins/temper/core" }
 temper-ui = { path = "../../plugins/temper/ui" }
+weld-core = { path = "../../plugins/weld/core" }
+weld-ui = { path = "../../plugins/weld/ui" }
diff --git a/tools/editor-check/src/main.rs b/tools/editor-check/src/main.rs
index 7a41eb6..cbc672d 100644
--- a/tools/editor-check/src/main.rs
+++ b/tools/editor-check/src/main.rs
@@ -10,8 +10,8 @@ fn main() {
         .find(|a| a[0] == "--plugin")
         .map(|a| a[1].as_str())
         .unwrap_or("rivet");
-    if !["rivet", "patina", "anvil", "crucible", "lathe", "temper"].contains(&plugin) {
-        eprintln!("Use --plugin rivet, patina, anvil, crucible, lathe or temper");
+    if !["rivet", "patina", "anvil", "crucible", "lathe", "temper", "weld"].contains(&plugin) {
+        eprintln!("Use --plugin rivet, patina, anvil, crucible, lathe, temper or weld");
         std::process::exit(2);
     }
     let patina = plugin == "patina" || args.iter().any(|arg| arg == "--resonance");
@@ -20,7 +20,10 @@ fn main() {
     let crucible = plugin == "crucible";
     let lathe = plugin == "lathe";
     let temper = plugin == "temper";
-    let (width, height) = if temper {
+    let weld = plugin == "weld";
+    let (width, height) = if weld {
+        (weld_ui::WIDTH, weld_ui::HEIGHT)
+    } else if temper {
         (temper_ui::WIDTH, temper_ui::HEIGHT)
     } else if lathe {
         (lathe_ui::WIDTH, lathe_ui::HEIGHT)
@@ -139,6 +142,22 @@ fn main() {
         }
         temper_state.accept_frame(engine.take_analyzer());
     }
+    let mut weld_settings = weld_core::Settings::default();
+    let mut weld_state = weld_ui::State::default();
+    if weld {
+        // Two layers of an F1 saw bass; the sidechain layer is polarity-flipped.
+        let mut engine = weld_core::Engine::new(48000., 2).unwrap();
+        engine.set_settings(weld_settings).unwrap();
+        let mut saw = common_dsp::Saw::new(48000., 43.65);
+        for i in 0..36000 {
+            let x = (saw.sample() * 1.6).tanh() * 0.4;
+            engine.process_sample([x, x], [-0.7 * x, -0.7 * x]);
+            if i % 1600 == 0 {
+                weld_state.accept_frame(engine.take_analyzer());
+            }
+        }
+        weld_state.accept_frame(engine.take_analyzer());
+    }
     let mut crucible_settings = crucible_core::Settings {
         folder: "C:\\Users\\you\\Documents\\Crucible".into(),
         ..Default::default()
@@ -227,7 +246,9 @@ fn main() {
     let session_motif = session.motifs[0].id;
     shared.replace(session).unwrap();
     let ctx = egui::Context::default();
-    if temper {
+    if weld {
+        weld_ui::style(&ctx);
+    } else if temper {
         temper_ui::style(&ctx);
     } else if lathe {
         lathe_ui::style(&ctx);
@@ -260,7 +281,9 @@ fn main() {
             },
             |ui| {
                 egui::CentralPanel::default().show(ui, |ui| {
-                    if temper {
+                    if weld {
+                        weld_ui::show(ui, &mut weld_settings, &mut weld_state);
+                    } else if temper {
                         temper_ui::show(ui, &mut temper_settings, &mut temper_state);
                     } else if lathe {
                         lathe_ui::show(ui, &mut lathe_settings, &mut lathe_state);