[sdiy] Analog synths with 2 pole filters

[Andrew Simper]

On 21 February 2013 10:34, Andrew Simper <andy at cytomic.com> wrote:
> 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)
> Formanta Polyvoks (svf)
> Arturia Minibrute (sallen key)
> Elektron Analog 4 (svf)
> Dark Energy v2 (svf)
> Future Retro XS (svf)
>
> 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)

And another, no self osc in 2 pole:
Oberheim OB8