Module Reference

Bus Channel Strip contains seven DSP modules in a serial signal chain. Each module:

• Has an individual bypass switch
• Is fully automatable (VST3 and CLAP)
• Can be reordered via the drag-to-swap handles in the GUI
• Runs on a lock-free, allocation-free audio thread

Signal Chain (default order)

API5500 EQ → ButterComp2 → Pultec EQ → Dynamic EQ → Transformer → Haas → Punch

This default order reflects a classic mastering/bus processing workflow:

1. Corrective EQ (API5500) — address tonal imbalances before compression
2. Glue compression (ButterComp2) — unify elements dynamically
3. Tonal shaping (Pultec) — add character after dynamics are controlled
4. Frequency-dependent dynamics (Dynamic EQ) — surgical per-band control
5. Harmonic coloration (Transformer) — analog warmth and character
6. Stereo widening (Haas) — spatial placement before the final ceiling
7. Peak limiting (Punch) — transparent ceiling catches any widener-induced peaks

Modules

Module	Source	Purpose
API5500 EQ	Custom Rust	5-band semi-parametric console EQ
ButterComp2	Airwindows C++ (FFI)	Bipolar interleaved glue compression
Pultec EQ	Custom Rust	Passive EQP-1A with LCR resonance, bandwidth control, 18 dB range
Dynamic EQ	Custom Rust	4-band frequency-dependent dynamics
Transformer	Custom Rust	Analog transformer coloration (4 models)
Haas	Custom Rust	Psychoacoustic stereo widener (M/S + comb)
Punch	Custom Rust	Clipper + transient shaper, 8× oversampling