The line loops between the green bars — that is the clip you hear. Each word is a bar with a handle at each end: drag the top handle to move where it starts, the lower one to move where it ends. Pull an end in and the pause after it stays dark — that is a gap. ✂ ends does that for every word on the line at once. If the highlight runs ahead of the voice press ◀ earlier; if it lags, press later ▶. The pass walks every line from the top and marks the ones worth a listen; ⚠ next (N) jumps to the next one.
By hand — advanced
By hand: shift the whole track, pin a line, click a word and nudge it, or hit ▶ START and
tap Space on each word as it plays (Z undoes, Esc stops). SAVE downloads
<track>-karaoke-feedback.json — drop it in data/ and every correction is re-applied on rebuild.