[sdiy] Analog synths with 2 pole filters

[Luís Marka]

The Jupiter 8 in 12dB mode is a 2-pole filter (am I right here, guys??).

On 2/20/2013 11:36 PM, Andrew Simper wrote:
> 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
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