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Lathe places EQ bands on harmonics 1-32 of the played note, so a cut on harmonic 3 stays on harmonic 3 on every note. Temper normalises each note's level before an oversampled shaper and tunes its floor, push and bright filters to the note, so every note distorts the same. The note tracker moves from Anvil into common-dsp, together with a state-variable filter, 4x oversampler and harmonic meter. Anvil's behaviour and editor render are unchanged. docs/ideas.md collects all plugin ideas and their status.
67 lines
3.0 KiB
Markdown
67 lines
3.0 KiB
Markdown
# Lathe
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Lathe is an EQ whose bands sit on the harmonics of the note being played.
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Current version **0.1.0**.
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A normal EQ works in fixed frequencies. A cut at 130 Hz takes out the 3rd
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harmonic of an F1 bass, the 2nd of a C2, and the fundamental of a C3, so the
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same bass sounds different on every note of a riddim line. Lathe follows the
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pitch and places one band on each harmonic: "−12 dB on harmonic 3" stays on
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harmonic 3 whatever note plays.
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## Install on Windows
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Copy `Lathe.clap` into `C:\Program Files\Common Files\CLAP\`. In FL Studio 2024.1
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or newer, open Options → Manage plugins, enable Verify plugins, and Find installed
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plugins. Load Lathe in a mixer slot of the bass, after the synth and before bus
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processing. Keep the font license with redistributed packages.
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## Work with it
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1. Play the bass. The note readout shows what Lathe tracks; the lower strip of the
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editor shows each harmonic's level going in (grey) and coming out (pink).
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2. Draw gains on the harmonic bars. Drag across bars to paint a shape;
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Shift-drag for fine steps; double-click a bar to reset it.
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3. Use the macros for the whole series:
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- **Tilt** brightens or darkens in dB per octave of harmonic number. The
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fundamental is the pivot.
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- **Odd/Even** lifts odd harmonics and lowers even ones (positive, more
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square-like) or the reverse (negative, more octave-like).
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- **Between** sets the gain halfway between harmonics. Cut it to clean up noise,
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beating and inharmonic grit; lift it for dirt.
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4. **Width** sets every band's bandwidth as a share of the harmonic spacing. Narrow
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bands touch only the harmonic; wide bands also move its surroundings.
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Other controls:
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- **Harmonics** is how many harmonics are shaped (8–32). Higher harmonics pass
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unchanged.
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- **Smooth** is the retune time for slides and pitch bends. A new note always
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retunes at once, on its attack.
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- **Gate** is the input level that counts as a note. Raise it if tails or reverb
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start new notes.
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- **Mix** blends with the delayed dry signal; **Output** trims the level.
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- **Snap to semitone** rounds the detected pitch. Turn it off for slides.
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- **Shapes** set the drawn gains: Flat, Odd only, Even only, or Hollow (harmonics
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2–4 cut).
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The drawn gains are saved with the project but are not automation parameters;
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the macros are.
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### Pitch from MIDI
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For basses whose fundamental is unclear (heavy FM, formant or noise patches),
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select **MIDI** and route the bass's MIDI notes to Lathe. In FL Studio, set the
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bass channel's MIDI output port and Lathe's input port to the same number.
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## Timing and limits
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Detection uses about 67 ms of lookahead, reported to the host for delay
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compensation, so the bands are tuned before each note's attack leaves the
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plugin. Pitch range is 30–500 Hz, one note at a time; chords are not separated.
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Before the first note Lathe passes audio unchanged; between notes it holds the
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last tuning so tails keep their shape. Bands above 0.45 × the sample rate are
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skipped.
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