2015-06-12 by smw-mail@...
So far as I know, unlike E-Mu samplers, you cannot use the big knob [aka encoder] to send program changes externally. I have a P2500 and the way I send program changes to it is from an external device. I don't think the Command Stations have a way to send them. I believe that, like on the P2500, the big knob just changes the preset internally, or records it onto a track, on a channel-by-channel basis.
Years ago, I played around with a 1 beat pattern that in record mode would echo out program changes, but since it tied up the sequencer just to do that, I had no use for it.
Maybe someone else has a way to do what you want.