Upward and downward compression in four bands whose edges are harmonic
numbers of the tracked note (default 1, 2-4, 5-16, 17 and up), so the
same setting squashes the same harmonics on every note. A fixed-band
OTT puts harmonic 2 of F1 and of C2 in different bands.
- Three Linkwitz-Riley splits at sqrt(k(k+1)) x f0 with allpass
compensation; at Depth 0 the bands sum within 0.05 dB.
- Band level is the RMS over one period of the note, so heavy settings
do not ripple at f0: a 40 Hz sine at Drive +12 dB, Time 10 % gets no
harmonics above -110 dB.
- At Depth 100 % on a saw, harmonics 1-12 change by the same amount on
F1, C2 and G2 (within 0.2 dB).
- Depth, Drive (on the detector only), Upward, Downward, Time, a gain
per band; edges Low 1-8, Mid 2-16, High 3-48 with four splits.
- Pitch from audio with about 67 ms lookahead, or from MIDI.
- Editor: harmonic ruler with draggable edges, level and gain per band.
- Catalog, workflows, editor-check, docs, signal chain and site copy.
docs/chain.md gives the plugin order for a bass track and the bus, the
latency each plugin adds, and the measured octave error of downstream
note trackers after Knurl: from C2 up the tracker reads an octave low
about 85 % of the time, and timing jitter adds 5-25 false note starts
per second. Knurl and Anvil guides point there and recommend MIDI as
the pitch source after Knurl.
docs/ideas.md gains the production-flow audit, next steps for every
released plugin, new ideas (Forge, Planish, Quench, Scribe, Bevel,
Peen) and a build order.
nvrl