Crumar Musical Instruments User Group.

Woohoo!

Thanks to the help of each of you, I got the SSM2044 Bit repaired! It
turns out that the problem was a combination of bad TL072 op amps and
one bad filter. Since I socketed the whole VCF board, I was able
to switch out the TL072's until most of the voices were working, then
I was able to narrow the problem and replaced one of the filters.

Thanks to everyone!

The CEM3328 Bit; however, still needs some work.

So far, I have three voices "sort of" working.  At least two of the
filter ICs seem to be bad, such that when I press a key, a faint knock
sound is heard on that voice, and nothing else.  I'm sure that I will
need a few more filters and a handful of TL072s, since rearranging
these allowed me to get the first three voices working.  I'm not quite
sure how the lower 9 TL072s correspond to the 6 filter voices yet.

One other problem is that the voices are out of tune, like the detune
slider is moved, although it isn't having any effect at all.

I think that one of the 4051 ICs may be at fault here.

Comments?