Suppose I add a PR300S and SOL to the 577. 1. Could I use the 3 MIDI couplers on different channels simultaneously to use distinct patches from the SOL on each division? For example, play a Spanish Trompet 8' on great and a Bourdon 32' on pedal, both from the same disk in the SOL. 2. Does the PR300S with SOL support layering patches on one channel? For example, concurrently play the Montre 32' and Principal 16' from the SOL through the pedal's MIDI coupler. (I understand that both scenarios would be subject to the polyphony limit.) I'd appreciate any gotchas anybody can point out with trying to do this. Mark Nailor New link to Christmas Music at www.frogmusic.com!