> So what if 1 expo conv per VCO is needed ? > What about a uC or Eprom-based multiplexed expo conv, > with several "simple" VCO cores... Yes, this works very well. The Korg Polysix did this very thing. Regards, Tony Allgood www.oakleysound.co.uk Oakley Modular Synthesisers Penrith, Cumbria, England