[sdiy] Difference between early and late revisions of the CEM3340?

[Michael E Caloroso]

If the VCA is not calibrated, the voice can't autotune.  The DC offset
throws off the autotune process.  This has fixed autotune problems in
the past.

MC

On 2/25/20, Oakley Sound via Synth-diy <synth-diy at synth-diy.org> wrote:
> Oh, and the key to tuning the OB-Xa is to turn auto tune off. It'll try
> to tune up at the start. Defeat this and calibrate the tuning of all the
> voices. The whole synth should be in tune before you re-engage autotune
> and hit auto tune. Think of the auto tune as a final tweak done on the
> fly only. The real tuning has to be done by hand.
>
> Don't forget to calibrate the pulse width control too. The auto tune
> works by switching the pulse wave to over 100% (or 0%?) to turn off VCO2
> when tuning VCO2, and vice versa.
>
> Unlike the JP-6 which can pretty much take any random CEM3340 and be in
> tune.
>
> Tony
>
> www.oakleysound.com
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