Thanks for your quick reply. Yes I thought of that too, but I don't see why the exact same MIDI setup worked with the my earlier Rocktron and TC units; if the Boss sends program changes on other channels why didn't the other units get PC changes as well? I still think I could be doing something wrong, but I think I tried everything…
I will see if I can get hold of another controller and check out what will happen. Thank you very much for your help so far.