Stone Development Roadmap

Phase 1 (Completed)

The foundational app engine is functional. Major features include:

Mono Recording: AAC LC microphone capture at sample-rate scaling.
Multitrack Timeline Playback: Concurrent audio routing using just_audio.
SQLite Local Storage: Relational schemas for song layers, lyric notes, and device health buffers.
Background FFmpeg DSP: Offline track noise reduction, electrical hum removal, and silence clipping.
Auto-Mix: "Make It Sound Better" parameter-based stereo panorama balancing.
Safety Systems: Container path migration healing and sandbox directory traversal protection.

Phase 2 (Active Development)

Moving audio timing out of the Flutter/Dart event loop to ensure precision. Upcoming features include:

C++/Rust FFI Audio Bridge: Low-latency audio buffer management.
Sample-Accurate Sync: Eliminate play alignment drift across multiple layer channels.
Native Waveform Rendering: Fast calculations directly from binary audio buffers rather than mock approximations.
Timeline rendering checkpoints: Crash-safe intermediate render caches.

Phase 3 (Planned)

Adding mixing flexibility and project management features:

Export Preset Integration: Update FFmpeg render scripts to apply EQ and dynamic compression parameters.
Tempo Snapping Grid: Add metronome tempo sync and timeline grids.
Track Renaming: Allow users to rename individual channels.
Acapella / Instrumental stems: Export separated track groups with a single click.

Product Roadmap &
Future Releases