The list didn't like my screen shot attachment, here's the rest of what I was saying in reply to Alex: Right, MIDI Channels are commonly referred to as 1 - 16, but in the data they're 0 - 15, because they're 4 bits. And that does correspond to the Device ID, or at least I would expect it to, that's the way it has worked in other MIDI implementations I've worked with. The byte stream at the head of each of the "chunks" of the data looks like this (all hexidecimal): F0 41 00 10 12 02 00 00 That's "SysEx, Roland, Channel 00, S-10, One Way Receive, address 020000 (this is the first chunk, the others increment the address by 0x100 for each chunk)" That all corresponds to the bits in the manual from section 7 (see attached screenshot; it's a scan so I can't just cut & paste). The archive I was referring to is this one: http://www.generalconcepts.com/sgroup/archive/samples/s10-bmarek/ I've spent a lot of time the last month combing the interwebs for something like this, and when I found it, it was awesome. I just have to figure out how to get it into the keyboard, since I don't have a way to write QD's from my mac or anything else....and I'm really not up for creating my own interface. Speaking of which, I did run across someone who recently started talking about trying to adapt hardware used to make an SD card look like a floppy drive for this kind of thing in order to emulate the QD. That would be great if it pans out, but it was in pretty early stages when I read it.... http://www.gearslutz.com/board/electronic-music-instruments-electronic-musi… There was another thread at the HxC forum asking about specs for the drive, I plan to post the link to the S-10 service manual I have, which has a lot of those sorts of details (timing etc), hopefully that will help someone move it along too.... Of course I have to wait until the forum approves me :-) Thanks for the suggestions....