3 requirement:

Preserves tone
Has at least 12 memory banks
Has reverse feature

I need 11 banks to have ambient pads that I've created in every key at hand (Well, at foot. I want this to be accessible on my pedalboard since I'm always behind my guitar, and this is live stuff ((Church)). I would love reverse and possibly fade function. But if someone can think of a way to get the first 2 things down, I would settle.