Deep DSP Drum Synthesis Implementation - #139
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- Added 15-bit LFSR noise generator in DrumUtils for authentic TR-909 Snappy. - Refined TR-808 Kick with two-stage amplitude envelope (diode damping emulation). - Updated TR-909 Snare to use LFSR noise and randomized start offsets. - Implemented early exit for zero-velocity triggers across all drum instruments. - Added randomized noise buffer offsets for all noise-based instruments to avoid 'machine-gun' effect. - Ensured strict positivity for exponential ramps to prevent Web Audio API errors. - Verified build and DSP compliance. Co-authored-by: Pitrat-wav <255843145+Pitrat-wav@users.noreply.github.com>
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| noiseGain.gain.setValueAtTime(velocity * 0.7, time); | ||
| // Use random offset within noise buffer for unique hits | ||
| const randomStart = Math.random() * (this.noiseBuffer.duration - snappyDecay - 0.1); |
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With Snappy near 1, snappyDecay can reach the full 0.5s buffer length (and variance can push it higher), so this.noiseBuffer.duration - snappyDecay - 0.1 becomes negative and the value is passed as the BufferSource start offset below. Negative AudioBufferSource offsets are rejected at runtime, so high-snappy 909 snare hits can throw/drop instead of playing; clamp the random offset to at least 0 or make the generated buffer longer. The same pattern was added in the 808 clap/snare paths.
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This PR implements high-fidelity virtual analog drum synthesis for the Telegram Mini App drum machine, strictly following the provided 'Deep DSP Analysis' research. Key improvements include authentic 15-bit LFSR noise for 909 instruments, non-linear amplitude envelopes for the 808 Kick, and various performance and stability optimizations for the Web Audio API.
PR created automatically by Jules for task 7614412750372832522 started by @Pitrat-wav