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

Oakley Sound oakleysound at btinternet.com
Tue Feb 25 16:52:58 CET 2020

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 



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