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- Theme: pick a light or dark Material base scheme by palette luminance and map the palette onto the container/variant/outline/secondary roles components actually read, so cards and secondary text stay legible on bright themes. - Audio: remove the experimental stereo-FX rendering and the tape-delay per-head balance (both worked poorly); each channel runs a single mono FX chain again. Master output and recording remain stereo (dual-mono content). - Tools: add tools/samplepack-builder.html, a standalone page for assembling Sampler .zip preset bundles (16 note-labelled drag-n-drop pads, audition, 16-bit mono WAV re-encode, duplicate-sample detection). Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Sizzletracker (Android)
A retro, grid-based music tracker for Android — monospace UI, pixel icons, demoscene-style pattern editing — playable equally with touch, keyboard, gamepad, and MIDI (USB or Bluetooth).
Features at a glance
- Tracker tab — 4-track pattern grid (note / velocity-hex / MIDI-channel per track), beat & bar coloring, tap-to-focus + drag-to-edit with haptics and scale-aware note entry; plus an 8-lane arrangement piano-roll (up to 256 beats) with A/B loop regions.
- Mix tab — 4 channels, each with an instrument + 4 FX slots, MIDI channel, volume, mute/solo.
- Toolbox tab — 16 slots for instruments (NES synth, sampler, SF2/XI) and effects (arp, transposer, LFO, tape delay, reverb, filters, 10-band EQ, bitcrusher). Every device has an auto-generated editor and text presets.
- Setup tab —
.sngproject save/load, color themes (with import/export), gamepad bindings, and searchable/collapsible MIDI bindings. - Background playback with a media notification (Play/Pause/Stop).
- Two-thread design — Compose UI on the main thread, a sample-accurate sound engine on its own high-priority thread.
Build & run
Open the project in Android Studio (2024.1+), let it create the Gradle wrapper if prompted, and Run on an API 26+ device or emulator.
CLI (after the wrapper exists — gradle wrapper --gradle-version 8.9):
./gradlew assembleDebug
Where to start reading
See docs/DEVELOPER_HANDOVER.md — a from-scratch tour written for a developer new to Android: architecture, the file map, the "one action / one song / two threads" model, how to add an instrument or input, and an honest implemented-vs-TODO list.
Fastest orientation in code:
model/Project.kt → input/InputAction.kt → ui/AppViewModel.kt →
audio/AudioEngine.kt.
Project format
Songs use a human-readable .sng text format (see io/ProjectIo.kt), aligned in
spirit with the desktop
Sizzletracker; a byte-exact
compatibility shim is a listed TODO in the handover doc.
License
TBD by the project owner.