Just joined so this may be a bit late but have you looked here: http://users.ece.gatech.edu/~lanterma/obmx/

--- In oberheim@yahoogroups.com , "joostdenhertog" <joostdenhertog@...> wrote:
>
> and did someone have it
>
>
>
> --- In oberheim@yahoogroups.com , "obnotrue" <ste.mari@> wrote:
> >
> > hello
> >
> > doe anyone know where I can find the last OS2 for OB-MX
> > and maybe even one card
> > are there any menbers who use this synth
> > I'm cheking one in these days,so please write of any advice
> >
>