Sent Fri, Mar 24th 1995, 01:27
> VCO that locks to an external audio source with a PLL There was a DIY with a PLL-VCO and 16 sliders for waveform control in an ELO issue in the 70's. Doepfer did a sound-sampler with a PLL for a HF (clock) VCO, many years ago. The Portamento problem shouldn't be as bad as the problems with conventional f/CV conversion, however. Problems are some kind of unintended Portamento and problems with modulating a locked VCO. I'd like the idea of a PLL with a precise VCO and a S&H that can open the loop, as soon as the frequency is stable, to add modulation and stuff then. JH.