Garage Band not playing audio track
I have a Garage Band project with imported tracks. One is a piano midi, the other an AIFF recording of a vocal. When I click Play in Garage Band the piano plays, but the vocal is completely missing.
This is what Garage Band looks like.
What might have gone wrong? What can I do?
I was working on another project earlier today with no problem.
iMac 27″, macOS 10.15