What the F- Happened??

I USED to love this app...then, without any reason, they upgraded and confused/ruined everything. What the hell is the lightning button? How DO I adjust the track mix point myself? And what if I alter already saved mixes? Can I switch them back?

What this app really needs for an upgrade is an undo button. And stop trying to fix what isnt broken!!

DenoVini about Pacemaker - AI DJ app, v1.6.1