Diki heres a few answers....:
"In theory it could do this, but it would mean entering some SysEx into the SMF, then use that in the juke box as a regular SMF.
To do it you would need to enter the code to change the GM input to "Keyboard", enter the SysEx to change the regis number, then SysEx to change the input back from "Keyboard" to GM. These are all listed in the technical tables. Probably need to enter these before the GM reset message.
I haven't tried this and don't have the technical tables to hand and so can't offer a "blow by blow" method. The Roland should be able to do this too.
Good luck
Barry Crane"
posted on the Yahooo Ketron group forum....