In a message dated 3/6/2000 7:23:46 AM, Juergen.Haible at nbgm.siemens.de writes: <<V/Hz and V/Oct is not an "exclusive or". There are good arguments to make both options available in modular VCOs. (Most expo converters provide an internal A/Hz summing node for free.) >> The oscillator in the Korg MS50 had both V/Hz & V/Oct inputs. SF