Hi

look at this thread

http://launch.groups.yahoo.com/group/oberheim/message/671


First do the self calibration as described. Maybe that helps. If not put the matrix in the voice display mode, so you see which voice number fails.
Then swap the voice chips and check if the failure moves with the chip.
If it does, replace the voice chip, if not there is something wrong in another place, which will be a harder to find.

good luck,

Ralf

--- In oberheim@yahoogroups.com , "fretnoize" <fretnoize@...> wrote:
>
> I just got a Matrix 1000, seems great, but I have voice issues in some patches, occasionally I'll come across a patch where two voices are a lot quieter or seem thinner or don't play. Other than that it seems to be working fine about 95% of the time.
>
> There was one patch where lots seemed kind of messed up, maybe that was the patch though (984) doesn't play up high in the register some don't play some seem thin.
>
> Is this usually fixed by replacing the CEM3396 chips is there a diagnostic to figure out which need to be replaced, or is it just advisable to replace them all if you're having trouble Or is this something completely different
>
> Thanks in advance!
> -Dave
>