[astrobyte-dev]

The first useful rhythm controls sat below laptop viewports, saved state was invisible, and Capture and recording results did not consistently lead back into making music. P5 brings the existing workflows together: Start Playing and reachable pads, optional contextual tips, grouped navigation, persistent transport and truthful save status, protected project switches, and direct Capture → Keep → Use and recording-result handoffs.

The fresh whole-product audit drove the work. Sound Lab, Jam, scenes, libraries and System share clearer language and focus behavior; keyboard Help, reduced motion, contrast, responsive layouts and recoverable empty/error states receive coverage. Classic remains available through System compatibility tools because raw code/routing, source import/export and several device/diagnostic capabilities still lack dependable Studio parity. No major feature family, authored project schema, DSP architecture or runtime ownership change is introduced.

Validation on Ubuntu 24.04.4:

• Complete suite: 380 discovered, 377 passed, 3 Windows-only skips; build and both typechecks pass.
• All eight inherited browser journeys and Linux lifecycle regressions pass.
• New horizontal product journey covers starter, rhythm, synth/FX/modulation, Jam/scene promotion, arrangement, import/capture/use, save/reopen, performance/recording, System and fault recovery.
• 24 axe accessibility checks report zero violations, with keyboard/dialog/focus and reduced-motion checks.
• Four desktop/laptop viewports pass overflow checks; before/after screenshots reviewed.
• Realistic stress fixture: 12 tracks, 16 scenes, 138 clips, 13 FX, 78 automation lanes, imported assets/chops and 12 alternatives. Short Chromium profiling records zero idle project-list requests; this is not a native DSP or long-session acceptance claim.

See completion report, prioritized audit and classic comparison, user guide, validation results, and screenshot comparison. The report records the exact implementation exit criteria, files, regressions fixed and remaining limitations.

P5 implementation and available Ubuntu validation are complete. Full native product acceptance remains pending:

• P2.6 Windows desktop/audio.
• P3 native audio/timing and Windows.
• P3.5A native audio/timing/CPU and Windows.
• P3.5B native microphone/audio and Windows.
• P4 native audio/timing/CPU/musical quality and Windows.
• P5 native whole-product/musical usability and real Windows desktop validation.

Ubuntu remains Level B — Runtime Safe. Deterministic audio fixtures and CI do not close native gates. No system installation, kernel, pending apt or audio-stack changes were made.

Draft stacked on feat/p4-jam-exploration, from exact base 0947f818d73d490d4e252182b0df47d716f4134a. Do not merge this or lower draft PRs as part of this delivery.