I'm simply a big believer in single function buttons, especially when they are virtual, and don't add to the cost of a hardware arranger.

I've got plenty to do simply playing. Anything that makes me go 'Did I hit that already?' gets in the way.

Graphically, it would be nice if the Chord Sequencer Rec button would flash red while it was in record mode... and maybe Play flash green while playing. Visual cues for what is going on are SO helpful on stage...

Oh, and if at all possible, please allow a user defined CC# for each function. If you have a controller keyboard or MIDI pedals, being able to do this from the musical keyboard (or your feet) rather than either hit a tablet screen or a key combination (on your laptop's keyboard) is optimal.