> > >Is there a (easy) way to modify this VC-BPF design : > >http://www.cgs.synth.net/modules/cgs35_syntha_vcf.html > >to add VC-Q to it ? > > Replace the Q pot with a LDR+LED (and 1k resistor parallel to the LDR) ? Mmh... I guess there my be a slighly more hi-tech, OTA-based solution... Thanks anyway, JB