> Dieter,
>
> Thanks for your explanation. I don't have a TL062 around at the moment (only TL072 and TL082) but I'll order some (they
> cost only €0,25). If replacing doesn't help I'll have to send it for repair.
>
> Best regards,
>
> Karel.

TL082 should work too. If you have a multimeter available you may also measure the output voltage at pin 7 of the TL062/082. It
should read 0V (or a small positive voltage) when 0V are applied at the transpose CV input. In any case no (small) negative voltage
should appear.

Best wishes
Dieter Doepfer