Disabling the Metronome in GarageBand for iOS

the background

You're using GarageBand for iOS for some multitrack recording, but are suppling your own click track for whatever reason. GarageBand wants to click and count off for you anyway. Here's how to stop it.

the starting premises

• GarageBand 2.3.8 for iOS (possibly other versions)
• iOS (iPhone OS/iPad OS) 13.4 (possible other versions)