Ian,

Not sure if this was your issue but apparently the 12X will only let you assign certain channels to certain switches. For example, the left and right sliders are only available to 2 or 3 of the aux channels (can't remember exactly which ones). It's a little bit annoying and you basically have to mix and match the aux channels with the switches available to each one. Too bad every switch is not available to every channel, it would make programing a lot easier.

Craig