Howdy, all. I've sent a similar message to comp.music.midi and rec.music.makers.synth, but I don't think I'll get many replies. I hope this isn't OT for the list (and that someone here knows the answer!) In any case, I'm trying to write an application that "does stuff" (not necessarily an editor/librarian, but with a small feature overlap) with the user bank and performance data on my TX81z here, and I'm confused about the VMEM bulk data format. 1. Page 74 of the manual states that address 6 (and 16, 26, and 36) is occupied by AME (b6), EBS (b4-2), and KVS (b1-b0) data. However, it also states that KVS data ranges from 0-7, which is clearly impossible in 2 bits. Where's the mistake? Should EBS be bits 5-3 and then KVS as bits 2-0? 2. How would one compute VMEM checksums? Heck, as long as I'm at it, what's the method for computing all of the checksums (i.e. VMEM, PCED, PMEM, SYS, microtune, etc.)? I have looked at the sourcecode for JSynthLib (which, for some reason, doesn't run properly in my environment -- too bad, because it seems to be a good program), but the answers to these questions were not really clear to me from an examination of its TX81z driver. (In its defense, very little bit-twiddling Java code is particularly clear.) In particular, either their checksum implementation is wrong or the TX81z manual is wrong (my money's on the latter). In any case, I'd be glad to hear from anyone with experience doing this kind of junk to the TX81z. It seems that most of the TX81z sysex info available on the net is for real-time control. best, wb -- Will Benton | "Die richtige Methode der Philosophie wäre eigentlich willb(a)acm.org | die: Nichts zu sagen, als was sich sagen läßt...."