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Implement Procedural DSP Drum Synthesis & Master Saturation#38

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dsp-drum-synthesis-15109311790411058056
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Implement Procedural DSP Drum Synthesis & Master Saturation#38
Pitrat-wav wants to merge 1 commit intomainfrom
dsp-drum-synthesis-15109311790411058056

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@Pitrat-wav Pitrat-wav commented Mar 28, 2026

This PR implements a high-fidelity procedural drum synthesis engine for the MIDI Studio, replacing sample-based placeholders with real-time DSP models of the Roland TR-808 and TR-909.

Key improvements:

  • 808/909 Kick/Snare/Hi-Hat/Clap: Custom Tone.js graphs using the exact frequencies, oscillator types, and envelope timings specified in the "Deep DSP Analysis" research.
  • Master Bus Processing: A centralized compressor and a custom tanh-based WaveShaperNode (4x oversampling) provide analog-style saturation and "glue" to the drum mix.
  • Analog Realism: Every trigger now includes micro-randomizations:
    • Phase randomization for oscillators.
    • Pitch drift (+/- 0.5-1Hz).
    • Filter cutoff and decay time variance (+/- 2%).
  • Velocity Sensitivity: All drum models now scale their gain and impact based on the trigger velocity.
  • Stability & Performance: All envelopes target a minimum of 0.001 to prevent Web Audio math errors, and node disposal is accurately anchored to the longest component's onended or onstop event.

Verified with npx tsc --noEmit and code review to ensure architectural integrity and type safety.

PR created automatically by Jules for task 15109311790411058056 started by @Pitrat-wav

@google-labs-jules @Pitrat-wav
Implement procedural drum synthesis and master saturation based on DS…
5b000cd 
…P research

- Completely refactored TR-808 and TR-909 drum models using Web Audio API/Tone.js based on circuit analysis.
- Implemented master saturation (WaveShaper) and compression (glue effect) in DrumMachine.
- Added per-trigger micro-randomization (analog drift, random phase, filter/decay variance) for authentic sound.
- Integrated velocity scaling across all drum instruments.
- Refined memory management with anchored node disposal to prevent signal cutoffs.
- Updated Sequencer and AudioStore to support advanced routing and velocity mapping.

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