I've had the conflict with Faderfox and things like playing midi keyboards. The Faderfox LV2 used midi channel 1, so I fixed that by selecting midi channel 2 on the keyboard midi out menu.
There are only 2 options, you can either change the Faderfox setup or change the midi channel used by the UC33.
Usually the Faderfox has just 2 setups in system mode, you can try changing it to the other setup. At least this is how it is with the second generation. I don't know about the third.
But more likely is to change the midi channel assignments used by the UC33 as you already know. I never used one of these so not sure how it can be done. Maybe you can change the UC33 midi output with some sort of editor included, then remap the UC33 manually in Live? Do you use automap for both controllers in Live's prefs? Sometimes automap can be limiting like that.
I would like NOT to use the automapped faderfox set up which comes with the included cd.
I want to map it my way.
the best solution would be changing the midi channel assignment on the uc33, as you said.
I tried to but it doesn't seem to work, but I guess it's my fault.
I have to find a way of changing the channels in the uc33 as they say on their manual.
hope someone has been there before and has some tips on this