Each lyric line is its own micro-player — tap to play just that line of the YouTube video, auto-stops at the next line. Drop down JP/EN study tiles per line. Lyrics ingested from LRCLIB, cached as local JSON (no live API call).
Scrub bar with touch drag, variable skip (5s/15s/30s), playback speed, long-press rewind to beginning. The rewind should feel instant.
newtestable
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Persistent YouTube Player
YouTube stays controllable from any tab. Floating mini-bar at bottom with play/pause and current time. Switch to Study or Runner without losing your place in the video.
newtestable
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Old English TTS Research
Every approach tried to make OE words sound human. Google, Azure, ElevenLabs, Inworld, Kokoro, autotune respelling, espeak-ng + voice conversion. Audio samples for each round.
active research
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Lyric Hero
Record lyric timestamps from YouTube, associate vocab words, hear real Google TTS audio. Tap completed lyrics to play back that song range. CreepHyp test song.
Play the video, scrub to each lyric line, tap to stamp the time. Exports timestamped lyrics as copy-paste text + JSON for Claude to add follow-along lyric sync to song pages.