Not dumb, but as I have several spare DAC chips, I tried that already.

Next plan is to dig into the service manual description of the Timer
Interface Serial I/O section, particularly as it relates to the tuning
process.
I'm starting to think that the voices are working correctly, but some
are receiving bad information. We'll see.

Thanks.
~GMM

On 7/10/2015 10:54 AM, John Leimseider john.leimseider@...
[chromapolaris] wrote:

>
> It may sound dumb, but I would swap the DAC... If a particular
> oscillator just needs one bit that isn't needed by any of the other
> oscillators and it's bad, by coincidence, you can have them fail. It
> wouldn't show up on the others, because it isn't needed. I saw this on
> a Polaris, and it took way too much time to find it. Can't hurt to try
> it. Same DAC as an OB8...
>
> Sent from my iPad
>
>