xtc/docs/RELEASE_NOTES.md

# 0.1.0 Development Release Notes

This remains a development prototype, not a production-qualified DAW. The local
release workflow is complete without bumping the application version, creating a
tag or publishing artifacts. The exact source archive SHA-256 and reviewed Git
commit identify a build; version 0.1.0 alone does not identify all of the
development revisions that used that version.

---

## Included Functionality

The C99 engine provides bounded graphs, immutable plan publication, stereo
audio, MIDI instruments and controller bindings, track/bus mixing, automation
and inline MIDI editing. The C++17 FLTK application adds arrangement, routing,
recording, undo/redo and a generic LADSPA editor. JACK is the only live
audio/MIDI backend; core validation and offline rendering work without it.
Native/LADSPA processors are trusted in-process code. No proprietary energyXT
resources are included.

Project format v13 reads versions 1–13 transactionally. Syntax diagnostics
identify records and lines. `xtc-check --inspect` lists dependency paths without
executing plugins. Timing/CPU/RSS reports, repeatable stress runs and virtual
endurance are available. Configurable install directories, shared install/remove
inventory, installed MIDI examples and source archive checksum sidecars are also
included.

---

## Upgrading and Removal

Back up documents and external media before upgrading. Opening an older project
does not rewrite it; saving upgrades it to v12, which older readers may reject.
Use Save As for a separate migrated copy. Moving a project folder preserves
media stored inside it via relative references. Absolute media and plugin module
paths must be restored separately. There is no bundled plugin/media migration or
saved JACK port configuration. See PROJECT_FORMAT.md and RECOVERY.md for exact
policies.

Install to the same layout to repair owned files. Only documented owned
filenames are replaced; unrelated files with other names remain. Use the same
source version and directory variables for uninstall. It removes owned files and
empty owned directories, never recordings or recursively deleting a prefix. A
changed layout or an older release with a different inventory may require
removing that old version before installing the new one. No
database/package-manager registration or automatic cleanup of historical
inventories is performed.

---

## Known Qualification Limits

Physical devices, multi-hour wall-clock endurance, power-cut behavior and other
Linux distributions remain unqualified. There is no disk streaming, crash
autosave, plugin sandbox, latency compensation or stable shared-library ABI. A
trusted plugin can allocate, block or crash the process. Metadata inspection
checks file availability only. See KNOWN_LIMITATIONS.md for the complete list.

The retained graph performance gate has a documented small-case timing alert on
the shared development host; the project timing comparison passed. This alert
was not hidden by changing the baseline. See PERFORMANCE.md before using these
measurements as latency expectations. Sanitizers and virtual endurance qualify
software paths, not hardware timing.

Default-configuration CLAP/VST2/VST3 mono effect loaders, common GUI
discovery/insertion/replacement and v11 format identity are supported. Pinned
MIT CLAP and BSD-3-Clause VST3 C headers ship with notices; VST2 uses original
compatibility declarations. Modern instruments, parameters/state/editors and
multichannel layouts remain unsupported. No third-party modern plugin has been
qualified.

CLAP/VST2/VST3 mono instruments are supported, bound to MIDI tracks, with
sample-offset notes, a saved live target, track mixing, GUI assignment/undo and
v12 persistence. See PLUGIN_HOSTING.md for compatibility and controller/state
limits.

A flat DAW workspace, shared dark theme, track-creation sidebar, read-only
musical transport/track inspector, colored track clips and real MIDI previews
are included. New MIDI/audio track commands are undoable and prepare candidates
before adoption. The default window is 1280 × 800, minimum 1220 × 720. No
dependency or project-format change. See WORKSPACE.md and the new
`modern-session.xtc` example; existing engine/plugin limitations still apply.

A sequencer grid/Snap dropdown, absolute grid snapping for moves and trims, MIDI
double-click editing, a piano velocity lane/slider and per-track instrument
dropdowns are included. Snap preferences are UI state; velocity and instrument
bindings use the existing v12 format. No new dependency or engine feature is
required. See WORKSPACE.md for supported divisions, controller semantics and
limits.

Edit / Preferences provides an Apply button and `~/.xtc.conf` INI persistence,
configurable plugin search paths and a file library, plus sequencer ruler loop
selection and sample-boundary playback wrapping. See PREFERENCES.md for
settings, reconnect behavior and looping limits.

The single-track mixer panel is replaced by a scrolling studio mixer: vertical
dB faders, flat pan knobs, mute/solo, routing and stereo meters on every track
and bus, plus a pinned master monitor. Selected-track automation remains below
the strips. No project format or engine changes. Screenshots are refreshed; see
MIXER.md and screenshots/README.md.

Searchable Commands (Ctrl+P), editable project BPM, a live track inspector,
session statistics, Fit song and an optional persistent Follow playhead control
are included. Numeric input remains intact during display refreshes. Screenshots
are refreshed, including the command palette. See WORKSPACE.md.

Dependency-free Soft Keys/Sub Bass instruments and Delay/Reverb effects are
included, with saved controls and automation. Choose instruments in track
headers; insert effects on selected graph wires from Edit. See
[BUILTIN_DEVICES.md](BUILTIN_DEVICES.md).

---

## Audio Source Editing

Audio clips now open a modal waveform editor with native frame selection, zoom,
source statistics, nondestructive timeline trims, selection export and save-copy
adoption. Local one-step undo supports reverse, polarity inversion, DC removal,
linear/equal-power fades and gain/normalization. Silence boundaries,
zero-crossing snapping and amplitude attack markers support transactional clip
slicing. Originals are never overwritten; exported media remains available to
project undo/redo. Source editing uses the existing mono downmix and bounded
snapshots; timeline cuts round to musical ticks. See
[AUDIO_EDITOR.md](AUDIO_EDITOR.md) for exact behavior and remaining limits.