I think this is described in the Z1 manual, find it here:
http://erikhall.mine.nu/~ronny/alla%20synthar.html



SynthEtic




--- In korgz1@yahoogroups.com, "Gerald Daniel" <gery-d@...> wrote:
>
> Having two Z1 I´m surprised to listen that one sounds more
brilliant.
> Unluckily the inferior one has the voice expansion. I´d totally like
to
> install it into the superior. The only thing I could do were to open
> both and watch how DSPBZ1 is installed, but before exchange I really
> have to know if there are instructions on the software side (perhaps
> initialisations or service routines from the service manual
> before/after??) At least I got a serv. manual but without advice I
> beware of touching anything. So I were glad if anyone could answer
this
> question.
>
> regards
> Gerry
>