I keep on wining about the interface of the rev2. I only use it because of the beautiful sound and endless possibilities; for usability, I would have left it for something designed by people who show they actually care about user experience. In concreto:
Given that one of the unique strengths of the rev2 is the dual layer possibility, why does it not have a hardware layer balance knob? Playing live, it's just terrible to go into the misc menu (ok, it's the first parameter, pfff) to adjust the relative volume of the layers. This is not something one needs only sometimes; when playing live, you need to be able to adjust this balance all the time!
I suspect that with a firmwareupdate, it's difficult to add a physical button. Maybe, some very direct shortcut can be made, like hold-wheel?