mikkeli/codename-206
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feat: per-channel dry/wet mix (parallel compression) replacing bypass

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Replace the per-channel bypass toggle with a smoothed dry/wet `mix` (0..100%,
default 100%). The blend is applied at the compressor output:
  out = delayed_input * ((1 - mix) + mix * wet_gain)
Dry and wet share the same delayed input, so it's phase-aligned (parallel
compression, no comb filtering). mix=0 is bit-identical to the old bypass.

The detector now runs even at mix 0, so the GR meter shows the wet gain
reduction regardless of mix, while the level/plot out trace reads the mixed
output. "Bands at 0% = simple full-band comp via All" still holds.

Update README + parameter docs (bypass -> mix).

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
This commit is contained in:
Mikkeli Matlock
2026-06-24 19:25:38 +09:00
parent eee94379bc
commit 42c5f7dcd2
5 changed files with 46 additions and 38 deletions
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README.md
+6 -6
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@@ -34,9 +34,9 @@ Built with **Rust** + **NIH-plug** (VST3 + CLAP output) + **egui** for the UI.
```
Input
└─ Crossover filterbank (Linkwitz-Riley LR4 @ each crossover freq)
├─ Band 1 (low) → pre-gain → look-ahead delay → compressor VCA → makeup ─┐ (bypassable)
├─ Band 2 (mid) → pre-gain → look-ahead delay → compressor VCA → makeup ─┤ (bypassable)
└─ Band 3 (high) → pre-gain → look-ahead delay → compressor VCA → makeup ─┤ (bypassable)
├─ Band 1 (low) → pre-gain → look-ahead delay → compressor VCA → makeup ─┐ (dry/wet mix)
├─ Band 2 (mid) → pre-gain → look-ahead delay → compressor VCA → makeup ─┤ (dry/wet mix)
└─ Band 3 (high) → pre-gain → look-ahead delay → compressor VCA → makeup ─┤ (dry/wet mix)
│
Sum of bands ◄─────────────────────────────────────────────────────------┘
└─ 'All' channel → pre-gain → look-ahead delay → compressor VCA → makeup
@@ -71,7 +71,7 @@ a first-class mode, not an afterthought.
### 'All' Aggregate Channel
- Structurally **identical to a per-band compressor** — reuse the same comp/lim code/params, just fed the summed signal instead of a filtered band
- Runs after the three bands are summed, before the output brickwall limiter
- Bands are individually bypassable; with all three bypassed the (phase-coherent) crossover sum equals the dry input, so the 'All' channel alone acts as a full-band comp/lim
- Bands have a per-channel dry/wet **mix** (parallel compression); at 0% (or all three dry) the (phase-coherent) crossover sum equals the dry input, so the 'All' channel alone acts as a full-band comp/lim
- Has its own look-ahead; the plugin reports a single **constant** total latency (the fixed band + 'All' look-ahead), set once — see Latency below
### Output Limiter
- Brickwall, ceiling = 0 dBFS or user-defined (`output_ceiling`). Look-ahead + sliding-max peak detection + a ceiling clamp guarantee the output never exceeds the ceiling
@@ -106,7 +106,7 @@ a first-class mode, not an afterthought.
- `release_ms`
- `knee_db` — soft knee width
- `makeup_db` — makeup gain (−24…+24 dB)
- `bypass` — per-channel bypass (bypassing low+mid+high = simple full-band comp via the 'all' channel)
- `mix` — per-channel dry/wet mix (parallel compression); 0% = dry (a clean bypass), 100% = fully processed. Bands at 0% → simple full-band comp via the 'all' channel
The 'all' channel uses the same struct so its UI and DSP are identical to a band; it just sits after the band sum.
---
@@ -230,7 +230,7 @@ display and draggable crossover handles, then replace the placeholder slider UI.
### Stage 5 — Basic egui UI *(basic version done early)*
- [x] Add `nih_plug_egui` editor
- [x] Sliders for all current parameters (`ParamSlider` grid)
- [x] Per-band bypass toggles
- [x] Per-channel dry/wet mix (parallel compression; replaced the bypass toggle)
- [x] Confirm UI controls update DSP in real time
### Stage 6 — Custom visualisations
- [x] Per-channel level meters (output level, `|L | GR | R|` cluster)