didn’t find this in the manual: in mute mode, when holding the chain button, you can perma-mute tracks by tapping the pads. they dim in colour, and you can only unmute them by the same combo, if you tap them in mute mode, they stay dimmed. can be useful to remind yourself not to turn on some channels… 
that’s a cool find! very useful!
cool, thanks!
song button works too btw