Multitrack note editing mode

[topherdavis]

For composing it would be really nice if there could be a side by side view of the note/trig for the tracks that could be edited simultaneously rather than having to always switching between track screens. I find it hard to jump back and forth and keep track what I am wanting to do if I'm trying to layer individual note changes to create chord progressions. Obviously there isn't as much real estate as the polyend tracker, but a super abbreviated version of that would be nice.