| name | membrum |
| description | Domain knowledge for the Membrum drum-synth plugin — per-voice signal path, preset/kit invariants, ring/range constraints, and where the deep tooling lives. Use when working on Membrum, drum synthesis, kits, pads, bodies/exciters, or Membrum preset retuning, especially outside the plugins/membrum/ tree where the leaf CLAUDE.md won't auto-load. |
| allowed-tools | Read, Glob, Grep |
Membrum — Drum Synthesizer
Membrum is a physically-modelled drum synth (AU aumu) and the current active-development plugin.
When editing files under plugins/membrum/, its leaf CLAUDE.md auto-loads with the build/test/param
facts — this skill carries the domain lore that also applies when you're reasoning about Membrum from
elsewhere (DSP library, presets, tooling).
Signal path (per voice)
Exciter (strike/noise) → Body resonator → parallel noise layer → per-voice shaper → voice → voice pool → master.
dsp/ splits into dsp/{bodies,exciters,unnatural}/; voice_pool/ handles polyphony; state/ is the state codec.- There is a Fast and a Slow two-block processing path — they must stay behavior-equivalent.
- Per-pad
noiseLayerGain multiplies the parallel noise layer; snares push it >1 so wire buzz reaches
near-body level (a snare's identity IS the wire buzz), while hats/toms/kick are unaffected.
Load-bearing constraints (violating these breaks presets or tests)
- Kit categories are FIXED:
Acoustic, Electronic, Percussive, Unnatural. Never invent new ones;
filesystem subdir AND XML metadata must both match.
- Ring/range:
maxPolyphony ∈ [4,16]; modeInject > 0 rings undamped (flat plateau);
Friction sustains without note-off (use NoiseBurst for one-shot swirls). Enforced by factory
round-trip + infinite-ring tests.
- Presets live in
C:\ProgramData\Krate Audio\Membrum\Kits\{category}\, NOT in the VST3 bundle.
Install via the build target; never hand-copy a single VST3 file (missing Resources/editor.uidesc
→ blank UI + crash on unload).
- UI data bridge: piggyback per-block UI data on the
MetersBlock DataExchange — don't add new
queues or IMessage loops.
Deep tooling (read these for real work)
