I'm sorry about the problems with the module. First of all please check if
your power supply is OK. Fluctuations of the supply voltages may cause such
problems.
If the supply is OK please return it to the dealer for repair. I suppose
that in this case the CEM3340 or one of the trimming potentiometers is
defective.

Best regards
Dieter Doepfer
Doepfer Musikelektronik GmbH
_______________________________________________________________________

Doepfer Musikelektronik GmbH
Geigerstr. 13
82166 Graefelfing / Germany
registered in Munich/Germany, commercial registry HRB 97 399
CEO's: Sibille Heller, Dieter Doepfer
website: www.doepfer.com
_______________________________________________________________________

> Also, as long as I observe the output frequencies, independent of
> the waveform, are not stable, it jumps around a few hertz or
> whole semitones.
>
> Best regards,
>
> Miltos