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Refine Drum Synthesis Engine with Analog Modeling and Master Saturation#31

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feat/analog-drum-synthesis-refinement-17872035354102568435
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Refine Drum Synthesis Engine with Analog Modeling and Master Saturation#31
Pitrat-wav wants to merge 1 commit intomainfrom
feat/analog-drum-synthesis-refinement-17872035354102568435

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@Pitrat-wav Pitrat-wav commented Mar 21, 2026

This PR implements deep DSP refinements for the drum synthesis engine based on the provided research on virtual analog instruments. Key enhancements include:

  1. Master Bus Processing: Drum outputs are now summed into a master compressor and a soft-clipping WaveShaper (oversample: 4x, amount: 20) to achieve the "glue" effect characteristic of analog drum machines.
  2. Analog Drift (Micro-randomization): Every drum hit now features subtle, per-trigger variations in pitch, phase, filter cutoff, and envelope decay. This prevents the "machine-gun" effect and adds organic "breath" to the rhythm.
  3. DSP Tuning: Refined pitch sweep durations and filter frequencies for TR-808 and TR-909 models to more closely match original hardware behavior described in the research document.
  4. Code Integrity: All changes are type-safe and have been verified against the project's TypeScript configuration.

PR created automatically by Jules for task 17872035354102568435 started by @Pitrat-wav

@google-labs-jules @Pitrat-wav
feat: refine drum synthesis with analog drift and master saturation
236bc48 
- Updated `DrumMachine.ts` to route individual drum outputs through a master compressor and `WaveShaper` for "glue" effect and analog saturation.
- Implemented micro-randomization (analog drift) across all drum models:
  - `TR808Kick`: Decay time variance.
  - `TR909Kick`: Pitch drift, random phase, filter cutoff variance, and decay time variance.
  - `TR808Snare`: Pitch drift, random phase for dual oscillators, filter cutoff variance, and decay time variance.
  - `TR909Snare`: Pitch drift, random phase, filter cutoff variance, decay time variance, and tweaked pitch sweep duration.
  - `TR808HiHat`: Random phase for the 6-oscillator matrix, filter cutoff variance for BPF/HPF, and decay time variance.
  - `TR808Clap`: Filter cutoff variance, snap interval variance, and decay time variance.
- Enabled 4x oversampling on the master `WaveShaper` to reduce aliasing as recommended by research.
- Verified all changes via TypeScript type checking.

Co-authored-by: Pitrat-wav <255843145+Pitrat-wav@users.noreply.github.com>
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