Authentic TR-808 and TR-909 Drum Synthesis Implementation#120
Authentic TR-808 and TR-909 Drum Synthesis Implementation#120Pitrat-wav wants to merge 1 commit into
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This commit enhances the drum synthesis engine based on deep DSP research: - Implemented 15-bit LFSR pseudo-random noise for TR-909 Snare authenticity. - Refactored pitch drift to use cents (logarithmic) for realistic analog deviation. - Added two-stage amplitude envelope to TR-808 Kick to simulate diode damping. - Optimized default Euclidean patterns for a better techno foundation. - Ensured robust node disposal and defensive scheduling for Web Audio stability. Co-authored-by: Pitrat-wav <255843145+Pitrat-wav@users.noreply.github.com>
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| export function applyPitchDrift(base: number, centsRange: number = 2.0): number { | ||
| const cents = (Math.random() * 2 - 1) * centsRange; | ||
| return base * Math.pow(2, cents / 1200); |
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This helper still has callers outside this diff that pass a drift range in Hz, for example TR808HiHat calls applyPitchDrift(..., 2.0) with a +/- 2Hz comment and TR808Cowbell passes the same value. After changing the second parameter to cents, those unchanged instruments now get only ±2 cents of drift instead of the intended hertz detune, so hats/cowbell lose much of their analog variation whenever they trigger. Please either keep a Hz-based helper for existing call sites or update every caller to the new unit.
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| cowbell: { steps: 16, pulses: 2, rotate: 2, decay: 0.5, pitch: 0.5, probability: 1.0 }, | ||
| // Optimized Techno Foundation Patterns | ||
| kick: { steps: 16, pulses: 4, rotate: 0, decay: 0.5, pitch: 0.5, probability: 1.0 }, // 4-on-the-floor | ||
| snare: { steps: 16, pulses: 4, rotate: 4, decay: 0.5, pitch: 0.5, probability: 1.0 }, // Standard backbeat |
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Because SequencerLoop builds the pattern with bjorklund(steps, pulses) and then applies rotate, this 16/4 snare default produces hits at steps 0, 4, 8, and 12; rotating by 4 leaves the four-on-the-floor spacing unchanged. New sessions and MIDI exports therefore place snares on beats 1 and 3 in addition to beats 2 and 4, despite the Standard backbeat comment and the previous 16/2 default yielding only steps 4 and 12.
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Implemented authentic TR-808 and TR-909 drum synthesis features based on the provided DSP research. Key improvements include 15-bit LFSR noise for the 909 Snare, cent-based pitch drift for all models, and a two-stage amplitude envelope for the 808 Kick. Default patterns were also refined for a better out-of-the-box techno experience.
PR created automatically by Jules for task 17738665374750726485 started by @Pitrat-wav