Record (push-to-talk from a selectable mic) or upload audio → Whisper/Moonshine transcription → saved notes with synced word-by-word replay (real Whisper segment timestamps; disabled with a hint for Moonshine), block-local semantic search over the notes (bge-small), a [No speech detected] fallback, cancel-in-flight, and delete-leaves-the-index. Owns its own speech-to-text model selector; every model downloads only behind an explicit action. Ships a justified block-local note index hook (use-note-index.ts — the VectorDB + indexed-id set that WAS a module-scoped singleton in audio-studio/models.ts, now block-local under the blocks carve-out). Fully on-device. Split from ui/blocks/audio-studio (Notes tab).