feature request: transpose selected notes

[deadpahn]

Hi, me again lol

I was thinking it would be cool to be able to transpose selected notes up or down like in other trackers. I'm working on a song right now and would like to keep my pattern as is but scale up the notes a bit for song progression.

So:

SELECT ALL NOTES via top screen
some arrow UP and DOWN in the side bar (where: SET, SEL, etc are)
When you press the arrow the notes on the screen change (up or down as you press)

THANKS