how do you switch from the 'simple' layout to the 'beatmachine' in the same song? do you just assign everything to different midi channels?

well, this is only possible, if -like in this case- the rotary object, is only once in this position on this page in this layout and not on the other one also used. e.g. you get problems when you try to control faders in "mix 2" and "simple" in each case, on the first page. there you can't control 2 different parameters with these sliders because the recieved OSC data is abolutely identic.