Making an AVO fader LOL

I had an odd request, which I could not seem to get to work. The user, an obvious avohead, wanted a fader, for the colorwheel on a cyberlight. I tried everything (I could think of) -- IPCB, man xfade, etc, and no success. Any ideas how to do something similar to this? It's come up more than once with something like color, gobo, anything thats not 0/255ish.
Comments
Did you want to control the roll speed or just colour position? Make sure there is no other lists/scenes that are stomping it with a higher priority.
Hope this helps.:)