Target/codes: compose two distinct four-event tracks for the same neutral fictional brief, keeping all four event identities fixed and explaining changed gaps; AC9AMUFD01/FC01. Prepare: blank pair in F, Practice G, gap cards.
- Welcome · 3 min. Choose a fictional paper visitor, picture-story opening or plain sound plan; no real person or movement is required.
- Model · 4 min. Adult compares M–S–M with S–L–M on two separate practice strips and names the first two changed gaps. Put the example away.
- Try together · 5 min. Child corrects an adult's mixed-up statement: four event marks are unchanged; one or more gaps differ.
- Child choice · 7 min. Child authors two tracks with three S/M/L choices each. Ask which spacing they would try first and why, accepting their own music words, pointing or AAC.
- Notice · 4 min. Save both first versions and exact changed gap positions; adult moves cards only on child direction. Actual listener fields stay blank unless real.
- Close · 2 min. A willing reader may look tomorrow; private keeping is equal access.