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Procedural Analog Drum Synthesis Implementation#39

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feature/dsp-drum-synthesis-4241081789685178247
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Procedural Analog Drum Synthesis Implementation#39
Pitrat-wav wants to merge 1 commit intomainfrom
feature/dsp-drum-synthesis-4241081789685178247

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@Pitrat-wav Pitrat-wav commented Mar 29, 2026

This PR implements a comprehensive procedural drum synthesis engine for the MIDI Studio, strictly following deep DSP analysis of classic TR-808 and TR-909 hardware.

Key improvements:

  • Authentic Synthesis: Oscillators and noise generators replace samples, using specific mathematical models for each instrument (e.g., Bridged-T networks, Schmitt trigger matrices).
  • Analog Drift: Introduced per-hit micro-randomization for pitch (+/- 1Hz), filter cutoffs (+/- 2%), and decay times (+/- 2%), providing an organic, non-repetitive sound.
  • Velocity Sensitivity: All instruments now respond to MIDI velocity by scaling their internal gain envelopes.
  • Master Processing: Enabled a non-linear WaveShaper (tanh-based soft clipping) and Compressor on the master drum bus to provide analog warmth and cohesion.
  • Engaging Defaults: The drum store now initializes with a rhythmic 909-based pattern (K:16/4, S:16/2 rot 4, CH:16/12, OH:16/2 rot 2).

All changes have been verified for type safety and visual layout.

PR created automatically by Jules for task 4241081789685178247 started by @Pitrat-wav

@google-labs-jules @Pitrat-wav
Implement procedural drum synthesis based on DSP research
bff6342 
- Replaced PCM-style logic with authentic Virtual Analog (VA) synthesis for TR-808 and TR-909 models.
- Implemented Bridged-T network emulation for 808 Kick and dual-mode resonance for 808 Snare.
- Added 909 Kick with triangle oscillator body and filtered noise click.
- Recreated 808 metallic Hi-Hat matrix using 6 square wave oscillators and parallel band-pass filtering.
- Implemented 808 Clap with triple-attack snap envelope.
- Added analog-style micro-randomization (pitch drift, phase randomization, filter cutoff variance, and decay variance) to all instruments.
- Enabled master bus saturation (WaveShaper) and compression for the "glue effect".
- Implemented velocity sensitivity across all drum models.
- Updated default Euclidean patterns and set TR-909 as the default kit for an immediate "drum party" experience.

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