# YazSes v2.10.0-dev.5 — Wave N complete: Echo + SRPace (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**.

Completes Wave N (`design/vision/v2-research/16-wave-n.md`) — structural editing, i18n &
accessibility-output correctness — with the eyes-free & blind-output tier. **All ten Wave N
features are now shipped.**

## New in dev.5 (all off by default)

- **Echo** (ADR-v2-119, `[echo]`) — "play that back" replays your *own captured audio* for a text
  span (not a TTS re-reading), so a homophone or ASR error is exposed by ear, eyes-free.
  `build_span_index` maps char ranges to audio time ranges from word timings; then
  `resolve_playback_target` turns "play the last word", "repeat 'foo'", or "play that back" into
  an audio `(start, end)` window. Anchor: Vertanen eyes-free ASR-error detection (arXiv
  2410.20564).
- **SRPace** (ADR-v2-120, `[srpace]`) — pace injected text to a screen reader's reading rate,
  clause-chunked, instead of dumping a paragraph as one burst that floods the reader.
  `chunk_clauses` + `plan_injection_schedule` assign each clause a cumulative delay from your
  configured words-per-minute so the screen reader announces each piece coherently. Anchor:
  screen-reader comprehensibility research.

`yazses features` now lists **135 capabilities**.

## Wave N complete
All ten features shipped (ADRs 115-124): HatSelect · Transliteration · BrailleOut · Spoken
Outline · Diacritize · SafeGlyph · WordFind · LoadGuard · Echo · SRPace — structural code editing,
internationalization, and accessibility-output correctness, every one pure, 100%-covered, and off
by default.

## Quality
1453 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** (pure span index + pure clause scheduler; audio
playback and the injector's delay honouring are existing I/O). The default install and the v1
dictation path are unchanged.