Yes, it can get confusing. I am still looking for your specific decoder ring, but I can at least share what I can glean from the manual I have. First, for all of the non-MIDI interested on the list, move on, its going to get ugly. ;) Your SYSEX message: F0 41 10 30 12 01 00 00 01 00 00 00 00 00 00 10 10 00 00 00 00 00 00 00 00 00 00 00 00 11 00 00 00 00 00 00 00 00 00 00 00 00 4D F7 is composed of a bunch of parts. F0 Start SYSEX 41 Manufacturer ID (Roland is 41) 10 Device ID (Rodgers organs by default is 10 - you can change in the setup menu at the organ if you wish) 30 Model ID (according to my 577 manual "30" is generic organ data "47" is specific to 577) 12 Send SYSEX (a receive is 11) 01 Offset Byte Data broken up in bytes (8 bits) 00 00 01 00 byte 1 bit 6 (remember we are offset by 1 so we should start with 1 note 0) 00 00 00 00 byte 2 00 10 10 00 byte 3 bit 3,5 00 00 00 00 byte 4 00 00 00 00 byte 5 00 00 00 11 byte 6 bit 7,8 00 00 00 00 byte 7 00 00 00 00 byte 8 00 00 00 00 byte 9 4D checksum F7 End SYSEX All we have to do is find the decoder ring that shows the stop mapping. I tried to match this SYSEX message with the list I have for my i577 without much luck. This bothers me a little since I thought all Rodgers used the same mappings (bigger organs just have more available). But a pedal Gedeckt 8 on the i577 would be byte 22 bit 4 and you don't have 22 bytes. Would you mind sending me the file Noel sent you? I will keep looking for a 790c reference. Perhaps a Rodgers tech has one? Hang in there, we'll get you going. Clay Composer-In-Residence, Frogmusic.com www.baacemusic.com ! ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Find new MIDI music and Guides to Rodgers Organs at www.frogmusic.com To post send messages to: rodgersorgan@xxxxxxxxxxxxx To unsubscribe or change mail delivery (digest, vacation) go to www.frogmusic.com/rodgersmem.html