I accidently left in 'Q' for switching tracks!
If you hold down the Z button for a second it goes into track select mode, where it changes on the beat and you let go to select.
I way overestimated what I could do in 2 days and didn't get round to making much of the music or implementing turning on/off music tracks and many things!
Next jam I take part in I'll really have to scope down my idea!
Thanks for looking!
I'm going to keep working on it!