MLXAudioBackend.generate() reads voice/ref_audio/language/speed from
its kwargs but never extracted ref_text — it was built, then silently
never passed through to self._model.generate(). CSM (sesame.py) only
builds its cloning context when BOTH ref_audio AND ref_text are
present; with ref_text missing, the context list stays empty and
indexing into it raises "IndexError: list index out of range" deep
inside mlx-audio, instead of the clone ever being attempted. Voice
cloning on the CSM engine could never have worked as shipped.
generation.py already threads ref_text all the way through — even
auto-transcribing it via the GPU pool when the caller supplies
ref_audio without one (~line 780) — so the value was always available
in kwargs; it just never survived the crossing into this specific
backend.
Reported with the precise root cause and a working fix (community
member independently diagnosed and patched it locally, confirmed
working on MPS/0.3.12). Two-line fix: extract ref_text and pass it
through when both ref_audio and ref_text are present (guards against
passing an orphaned ref_text with no accompanying audio to engines
that don't expect it).
Tests: tests/test_engines.py — ref_text is passed through when paired
with ref_audio, omitted when ref_audio is absent.
Also documents the second bug from the same report (#1013): macOS
microphone permission never prompts, so OmniVoice never appears in
System Settings to grant access. Root-caused to an unresolved upstream
Tauri/WebKit limitation (WKWebView's requestMediaCapturePermissionFor
delegate — wry#1195, tauri#11951, fix wry#1196 still open/unmerged, no
released version to bump to) — not something fixable here without an
unverified native Rust/WKWebView hack this session has no way to test.
Documented in docs/install/troubleshooting.md with the confirmed
workaround (record elsewhere, upload the file).
Co-authored-by: mergetest <test@local>
Co-authored-by: Claude Fable 5 <noreply@anthropic.com>
