This information was provided by one of the designers of the Peavey PC1600 and PC1600x, in March '98. Regarding the downward compatibility of 1600x patches with 1600 units: > Yes, you can go back. Just remember: > > No gc, dv, rv or cs (show up as FC through FF, not in order) > No setup scene (MAY CRASH THE OLD UNIT IF NOT OFF) > No bank MSB (look ugly, send nothing, as if OFF) > No Send Scene button functions (Look ugly, do nothing) > No Send Fader button functions (Look ugly, do nothing) > And anything else I forgot... Hope this information is useful to you! Dan Nigrin dan@defectiverecords.com