> From: Robert Weigel
>
> For some reason the other voices sound fine. 3 was the
> worst. After cleaning things up a bit..now 2 is what three
> was. Oh and I swapped out the fast 4051 analog switch and op
> amp that drives the vca in. I was seeing a sawtooth there...
> leaky S+H I was thinking?

Yup, that's what leakage looks like.

> Also 5 doesn't tune yet I can turn it back on and it sounds
> ok. it's envelope is strange though. Sustains with that
> level at zero then turns off w/out it moving. That makes no
> sense. hmmm. rechecking that..anyway if anyone has seen
> anything similar... I saw something kinda similar on a siel
> dk600 where it was that voltages were peaking on the DAC out
> higher than the reference voltage on 4051's. I adjusted the
> dac though and...why would it be doing it on three and not
> the last three?

Not sure what you mean by "Sustains with that level at zero then turns off
w/out it moving." However, I do recall that the volume envelope has a
squelch so that when it gets to zero, it is suddenly driven negative, to
kill any possible bleedthrough. When you do the Volume Offset adjustment
(LF, A, 9), this squelching is suppressed so that you can hear if there's
any residual offset. Unless you mean something completely different, I think
you need to do the Volume Offset adjustment.

--

Ciao, Paul D. DeRocco
Paul mailto:pderocco@...