Hi Dieter,
Thanks for the info.

> P6/100k: frequency offset (defines the absolute filter frequency when the
> VCF Frq. control is fully CCW)

It was exactly how this one gets set I was particularly interested in, i.e. just where the overall frequency range of the filter ends up. Do you apply a signal of known amplitude and frequency, and then adjust so that the output has such-and-such an amplitude (hence setting the cut-off at the desired point), or what !

Thanks, Tim