yeah... I remember years ago I had an MKS7 and I had a shareware program on my Amiga that I developed a "driver" for the MKS-7 for. it's tricky because the switches values are packed into a byte (or 2 bytes?? can't remember) anyway - you nee do know thew desired value of all switches to update any of the switch positions.. was a bit painful. and how easy would it have been to just give the damn thing a separate offset value for each switch? It's not really a problem with doing a custom editor program or box, but very non-standard for most "configurable" sysex generating programs. it's another example of early MIDI implementation, where you just want to scream "WHYYYYYYYYYYYYYYYYY?" at the sky, and collapse into a sobbing heap.
aaaah well.. have you tried this site?
http://ctrlr.org/It seems to have a Juno106 editor as a VSTi. very cool project - guy i basically making up free VSTi editors for everything he can. though it's changed since i was last there - only one file in the DL page.. possibly has packaged them all up together, or made a general editor that does everything?