Beepster For what it's worth I have an M-Audio Oxygen 25 and it works with X2. I just plugged it in and I was able to play without drivers or anything. There don't seem to be any preset maps for the knobs and stuff though but it's not too hard to map that stuff manually... except for some of the broken stuff in X2 but I don't think even the Roland stuff works with those controls from what I've been told.
Frostysnake I enjoy my APro800...although I am not sure if it is 61 keys...wow...I should know this..LOL