Target/codes: plan four fixed events with three matching M gaps and name what is held constant; AC9AMUFD01, AC9AMUFC01. Prepare: B steady track, Practice B.
- Welcome · 3 min. A paper camera story can have four fictional frame changes; our marks are musical event starts, not an actual device's capture times.
- Model · 4 min. Read four identical L/V/A dots and the three M blocks. Point to three equal start-to-start spaces; no extra beat or sound is inserted inside a gap.
- Try together · 5 min. Child overlays three same-size tactile blocks or checks the M–M–M words. Adult may produce only locally cleared quiet sounds; the score route remains available.
- Child choice · 7 min. Child makes a steady four-event strip for a book corner, four paper lights or a plain track. They choose a reason such as “I want the starts even”; no prescribed emotion.
- Notice · 4 min. Save the three gaps and fixed pitch/source/level. Do not mark an actual steady performance observed without hearing or timing one.
- Close · 2 min. Next we keep the events but move their starts closer.