First Report: Make sure the PR-300 MIDI cables are in the SEQUENCER ports on the interface under the organ keyboards. Plug the new voice module into the MIDI port OUT . Plug the the audio cables from the MIDI Interface board on the organ that would normally go into the back of the PR-300 (note, some need a 1/4" to rca phono plug adapter from Radio Shack -the SC-8820 does, you will need two.) into the back of the new voice module. Then on the PR-300 move the tiny switch on the back labeled ORGAN from EXT to INT. Finally go into the controls on top of the PR-300, hit MIDI and change all MIDI Channels from CH 1-10 to EXT, then hit enter. You are ready to play. That's it. It's time for field testing, go for it. MIDI disks work normally, playing both the organ and the new module. noel jones New Guide to Playing MIDI Voices...with Music you can play in church. See Playing MIDI Live at the Organ at Frog Music Press! To unsubscribe or change mail delivery (digest, vacation) go to our website at www.frogmusic.com