M8 just take the manual with ya on the Bus/ Underground... It should b as easy as changing the patch/ program/ preset or what ever it's called in Roland's language...

On most programs it's as easy as right clicking the knob/ fader u want 2 control and the choosing link to controller ou assign 2 midi controller something like that ... most of them also feat an option called learn midi which means it will automatically assign itself 2 the controller u send when u activate the funtion, so just activate and flick the knob...

Prior 2 that u have 2 configure the program's midi input for the PCR...

That's it mainly!

Z