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Changelog

v1.15.7 — Diode Ladder Allocation Fix

Audio Engine

  • Poly-synth worklet: diode-ladder clipper closure was allocated per sample inside process(), violating the zero-allocation invariant (GC dropouts); hoisted to a module-level function, behavior unchanged
  • Regression test: process() source is asserted closure-free

v1.15.3 — Docs Polish

Docs

  • README: corrected the Project Layout description of docs/ (technical reference docs, not "11 chapters")
  • Version bump to 1.15.3

v1.12.0 — Review Fixes

Stability and correctness fixes from the 2026-06-09 code review.

Audio Engine

  • External MIDI clock sync no longer double-triggers: internal sequencer schedulers suspend while synced
  • Poly-synth worklet now loads in eco mode, with notes queued until the worklet is ready
  • Removed per-process() Float64Array allocation in the poly-synth worklet
  • Song-transition and breakdown ramps stay alive through heartbeat and scene loads
  • Trance gate rates re-derive on tempo change
  • Metronome click driven from the synth device only (fixes doubled metronome)
  • songStop pauses only connected devices; setLowCut rewires correctly after a bypassed rebuild
  • Prior engine shuts down before a preview starts (no more duplicate engines)

Link, Jam & Worker

  • Link bridge never pushes the browser BPM on connect and never echoes received tempo back
  • Jam reconnect timer cleared on unmount
  • Worker: cache writes wrapped in waitUntil; KV counters documented as best-effort

Docs

  • Link bridge docs corrected: the WS server intentionally serves the whole LAN, not just localhost

v1.5.0 — Sound Quality Overhaul

103 commits. The biggest update to mpump's audio engine since launch.

New Genres

  • Dubstep (140 BPM) — half-time drums, wobble bass, sparse atmosphere
  • Lo-Fi (80 BPM) — boom-bap drums, walking bass, jazzy Rhodes chords
  • Synthwave (118 BPM) — 80s drums, octave bounce bass, arpeggiated leads
  • Deep House (122 BPM) — four-on-floor, smooth bass, organ stabs
  • Psytrance (145 BPM) — driving kicks, KBBB rolling bass, acid leads
  • ~300 new patterns across the 5 genres (20 drum + 20 bass + 20 synth each)
  • Total: 20 genres, ~1210 patterns

Sound Engine

  • All 9 drum voices tuned to Roland TR-808/909 reference samples
  • Drum voice levels matched to 808 RMS (±30%)
  • DC offset click artifacts eliminated on all drum voices
  • 3 filter models: DIG (standard), MOG (Moog 4-pole ladder), 303 (diode ladder) — via AudioWorklet
  • 4 new oscillator types: PWM, SYNC (hard sync), FM (2-operator), WTB (wavetable with 5 tables)
  • Filter drive for resonance and self-oscillation
  • Analog oscillator drift for warmth
  • Bitcrusher upgraded to AudioWorklet with true sample-rate reduction and triangular PDF dithering

Effects

  • 10 effects (was 8) — added Flanger and Tremolo
  • Reverb: 4 types (room, hall, plate, spring) with early reflections and allpass diffusion
  • Chorus: 3-voice with feedback (was 2-voice)
  • Phaser: 6-stage (was 4-stage)
  • Distortion: higher resolution curve with asymmetric clipping
  • Soft-clip: two-stage tape-like saturation

Presets

  • 33 synth presets (was 19) — includes Sync Lead, FM Bell, PWM Pad, Hoover, Wavetable Pad, Organ, String Pad, Pluck Lead, Sub Lead, Rhodes Keys, and more
  • 22 bass presets (was 14) — includes 303 Acid, FM Bass, PWM Bass, Jungle Bass, Sync Bass, Arp Bass, Psy Bass, and more
  • 21 mixer scenes — genre-matched EQ/compression/width profiles for all 20 genres plus Default
  • Existing acid/neuro/reese presets updated to use MOG/303 filter models

Mixer

  • Per-channel 3-band EQ for drums, bass, and synth with SVG frequency response curve
  • Multiband compressor with adjustable amount (0-100%) and ON/OFF toggle
  • Stereo width control via Haas effect on high band
  • Low-cut filter (0-200 Hz) for phone/laptop speakers
  • Per-channel trance gate for synth and bass — tempo-synced volume chopper with rate, depth, shape, circular SVG
  • Mix scenes: 21 built-in genre profiles + user save/load (SCN)
  • Mixer undo (Cmd+Z) — snapshot stack for EQ/drive/width/lowCut/multiband changes
  • Mixer settings now included in share links

KAOS View

  • VOL / EQ / KIT / GATE buttons per channel (replaced inline volume slider)
  • Each opens a dedicated modal with controls and SVG visualization
  • 🎛 scene picker dropdown in header — one-tap genre mixer optimization
  • Dropdown labels for clarity ("Mix Scene", "Set All Genres")
  • Larger touch targets on channel buttons

SYNTH View

  • ⌨ QWERTY keyboard playing — Z-M lower octave, Q-U upper octave
  • ✎ Step-record mode — write notes into pattern via keyboard (Space = rest, Backspace = undo)
  • [ / ] octave shift (±3 range)
  • ⌨ and ✎ mutually exclusive across all instruments
  • Oscillator buttons grouped: standard (SAW/SQR/SIN/TRI/PWM) | advanced (SYNC/FM/WTB)
  • DIG / MOG / 303 filter model selector in filter section
  • Detailed tooltips showing full key mappings

Master Bus

  • Default EQ: flat mid (mud cut handled per-channel on bass only)
  • Default volumes: drums 0.8, bass 0.6, synth 0.6
  • Bass channel: -4dB cut at 300Hz to reduce low-mid mud
  • Drum channel: +2dB low shelf, -1dB high shelf

Bug Fixes

  • Cmd+R randomize — R keyboard shortcut was firing before browser reload, randomizing the session. Now blocked when Cmd/Ctrl held.
  • Session persistence — save button now also updates autosave. Autosave runs every 3s (was 10s).
  • Filter drive connection — filterDriveNode was never connected to the filter, causing silence on presets with drive > 0.
  • Worklet filter volume — MOG/303 filters were 3x quieter than digital due to tanh compression. Gain-compensated.
  • Drum mute UI — mute state now persists across view switches.
  • VU meter routing — fixed after per-channel EQ insertion.
  • Step bar visibility — bars were invisible because accent + "b3" is invalid CSS when accent is a CSS variable. Now uses color-mix().
  • DrumKitEditor crash — sample packs without all voice entries caused undefined access. Falls back to defaults.
  • Retrigger artifacts — drift LFOs skipped on retrigger to prevent phase beating.
  • Hard sync — slave phase now resets to 0 (was incorrectly offsetting).
  • Resonance scaling — exponential mapping for worklet filters (Q=4 → 1.3, Q=20 → 4).
  • Update banner — added dismiss button.

Documentation

  • Updated README with full feature set
  • Chapter 7: Drum Voice Tuning — 808/909 reference methodology
  • Chapter 8: Pattern Generation — format, pipeline, genre conventions
  • Chapter 9: Sound Library — preset design, genre matching, sources
  • Comprehensive inline comments on all drum synthesis, worklet algorithms, and tuning decisions

Quality

  • 34 automated sound quality regression tests (drum artifacts, level matching, synth clipping, preset counts)
  • Run: npx vitest run src/__tests__/sound-quality.test.ts