Mark, I am not a PR-300 & SOL expert, but I do have both plus a 577. As far as I have been able to asertain, you can only use the one voice that is currently selected from the SOL on the PR300. No layering, no combining individual voices (there are some very nice groups as part of the SOL, however). Clay ____________________________________________________________________ To unsubscribe or set to vacation, go to www.frogmusic.com/rodgersmem.html If you have any difficulty with this or PayPal, please contact noeljones@xxxxxxxxxxxxx for help! Shop for Playing Guides to your Rodgers Organ at Frog Music Press