[sdiy] [OT] Analog synths with 2 pole filters

[Andrew Simper]

This is a repost with [OT] in the subject, sorry for not adding that
in the first place.

Hi Guys,

I'm having a discussion with a friend who said that "most analog
synths with 2-pole filters won't self-oscillate". I know quite a few
analog synths with 2-pole filters that do self osc, so I thought I'd
write up a list to shed more light on the situation.

Can you guys please help me fill in the considerable missing gaps by
naming some more and/or correcting what I already have? I know that
you can make ladder / cascade / svf / sallen key 2-pole analog filters
that self oscillate, this is really just seeing how most production
synths have been designed.

Analog synths with 2 pole filters that self oscillate
--
Korg MS-10 / MS-20 / Monotron / Monotribe (sallen key)
Steiner Parker Synthacon (sallen key)
Oxford Synth Company OSCar (svf)
Electronic Dream Plant Wasp (svf)
Oberheim Xpander (cascade with summed taps)
Formanta Polyvoks (svf)
Arturia Minibrute (sallen key)
Elektron Analog 4 (svf)
Dark Energy v2 (svf)
Future Retro XS (svf)
ARP Odyssey whiteface mk1 (svf)
Oberheim OB-Xa (svf)
Oberheim OB-8 (cascade-ish - need to adjust res trimmers)

Analog synths with 2 pole filters that don't self oscillate
--
Oberheim SEM (svf)
Roland JP6 (svf)
Alesis A6 (svf)
Prophet 8 / Prophet 08 (cascade)
Yamaha CS 80 / CS 40 (svf)

Thanks!

Andy
--
cytomic - sound music software