# YazSes v2.8.0-dev.3 — Wave L continues (developer preview)

**Pre-release · not published** (publish workflows are pinned to `v0.x`/`v1.x`; v2 dev tags do
not ship). **v1.4.1 remains the stable release.** Every feature is **OFF by default**.

Continues **Wave L** (`design/vision/v2-research/14-wave-l.md`) with the turn-taking pair:

## New since dev.2 (all off by default)

- **Hesitation-Hold Endpointing** (ADR-v2-101, `[hesitation]`) — when you trail off with a *filled*
  hesitation ("annnd… uhh…") instead of clean silence, YazSes recognizes you're still composing and
  holds the turn open instead of cutting you off. `is_filled_pause` (flat F0 + stable spectrum) +
  `endpoint_decision` (extends the commit threshold right after a filled pause). Especially helps
  slow/aphasic/aging speakers. Anchor: Chatziagapi et al., filled-pause detection (ACII 2022).
- **Pitch-Contour Vocal Gestures** (ADR-v2-103, `[contour]`) — hum a pitch *shape* as a word-free,
  language-independent command: rising = confirm, falling = cancel, rise-fall = undo, flat = repeat.
  `normalize_contour` (semitone deviations) + `classify_contour` + `gesture_to_command`. Robust in
  noise; for users who can phonate melody but not clear speech. Anchor: Vocal Joystick line + Meyer,
  *Whistled Languages* (2015).

`yazses features` now lists **111 capabilities**. (Pitch-Contour Gestures is experimental — `features
enable` requires `--force`.)

## Wave L remaining
Mouth-Sound Switch Access · Breath-Paced Dictation · Whisper-Aware Mode ·
Involuntary-Vocalization Auto-Excision.

## Quality
1356 tests green across Linux × macOS × Windows on Python 3.11 and 3.12. Both new cores are
unit-tested to 100% with **no new dependency** (F0/spectral extraction is an optional lazy extra);
this drop also fixed a real contour-classification bug (z-score normalization amplified flat pitch —
switched to semitone deviations). The default install and the v1 dictation path are unchanged.