Diki, I have never seen a way to link an MP3 to a performance or user program..Not on the E80 version 2, Prelude version 2, or the BK5..As you say...they will have to be selected independent of each other..

I haven't checked out the BK9...maybe it could be the first Roland arranger to link the MP3 with performances..Audio loops in sync with styles...seems logical that it could link what you need..