The Syrinx used two CEM3350 chips, so it's another SVF-based design. Not that that is any kind of criticism. On 13 Aug 2009, at 10:40, Bert Vermeulen wrote: > Syrinx filter! > > Bert > > 2009/8/13 Tom Wiltshire <tom at electricdruid.net> > > I'm definitely a fan of resonators