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@dfeen87 dfeen87 released this 25 Oct 03:26
· 138 commits to main since this release
v4.0.0
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ISLA v4.0.0 — Remastered Audio & Control Center

ISLA v4.0.0 introduces experimental Remastered audio processing, expanded playback and export capabilities, and a refined desktop Audio Control Center.

This release builds on v3.3.0 while preserving the established Velvet, Legato, Melt, and Original/Bypass processing modes.

What's New

v4.0 Remastered Audio

  • Introduced experimental Remastered Velvet, Legato, and Melt processing for ALIVE local-file playback and continuous LIVE monitoring.
  • Added adjustable processing depth from 0–100% in 5% increments, independent of listening volume.
  • Added source validation, numerical safety checks, preparation progress, cancellation, and restoration of the previous ALIVE mode.
  • Preserved the existing production DSP modes and historical research implementations.

Audio Control Center

  • Organized the native Qt interface into three workspaces: ALIVE | v4.0 Remastered | LIVE.
  • Improved mode selection, device configuration, playback controls, and diagnostics.
  • Added independent ALIVE and LIVE listening-volume controls with mute functionality.
  • Improved control-state synchronization, error reporting, and recovery behavior.
  • Added full-screen launch support for the desktop interface.

Playback, Import, and Export

  • Expanded ALIVE local-file support, including DRM-free AAC/M4A and Apple Lossless imports on macOS.
  • Added Save Mix to export prepared ALIVE audio as lossless 32-bit floating-point WAV files.
  • Added background export, cancellation, overwrite protection, and cleanup handling.
  • Improved local audio-file discovery and Bluetooth output-device selection.

Fixes and Improvements

  • Corrected several Qt control-state and mode-selection issues.
  • Improved LIVE volume attenuation, device refresh, and monitoring recovery handling.
  • Improved Remastered preparation, mode restoration, and failure recovery.
  • Fixed stale interface warnings and rejected-setting synchronization.
  • Excluded a specific PySide6 dependency version associated with a reproducible Qt runtime crash.

Testing and Verification

The final implementation passed its documented pull-request acceptance checks, including:

  • Nine hosted CI jobs covering Python acceptance, Qt interface tests, and the Linux C++/VST3 build.
  • Remastered intensity and LIVE processing-equivalence regression matrices.
  • Audio output-gain and Save Mix regression tests.
  • Additional GUI, playback, recovery, and state-management tests.

These automated results do not constitute comprehensive physical-device or perceptual listening validation.

Known Limitations

  • Remastered processing remains experimental. Its scientific evaluation is REVISE / INCONCLUSIVE; improved perceived audio quality has not been established.
  • Remastered ALIVE preparation is limited to supported WAV excerpts of up to 30 seconds at 44.1 or 48 kHz.
  • LIVE monitoring requires compatible macOS audio routing and a supported output device. Bluetooth latency and device-dependent interruptions remain possible.
  • Some reported native playback artifacts have not been conclusively resolved.
  • A standalone macOS application installer is not included.

Getting Started

Requires Python 3.10 or newer. LIVE monitoring targets macOS 13 or newer.

git clone https://github.com/dfeen87/ISLA.git
cd ISLA
python3 -m venv .venv
source .venv/bin/activate
python -m pip install -e '.[gui]'
python -m isla window

For installation details, audio-routing instructions, listening examples, and research documentation, see the README.

Project Information

Author: Don Michael Feeney Jr.

License: MIT

Repository: https://github.com/dfeen87/ISLA

Previous release: v3.3.0

Release tag: v4.0.0

ISLA remains an open-source audio-processing and research project combining practical music playback with experimental digital signal processing.

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