In the waveshapes... :-) http://www.till.com/articles/QuadTrapVCO/ On 5 December 2015 at 09:16, Rick Jansen <rick.jansen at xs4all.nl> wrote: > Wow, the Harry Winston one? Where are you credited..? > > rick > >> On 05 Dec 2015, at 00:21, Donald Tillman <don at till.com> wrote: >> >> Quadrature Trapezoid