[sdiy] Analog synths with 2 pole filters

[Andrew Simper]

Thanks Doug!

I'll add them to the list, and re-post it with [OT] in the subject :)

Andy



On 21 February 2013 12:58, Doug Terrebonne <dougt55 at yahoo.com> wrote:
> Actually most 2-poles DO oscillate, your friend has it backwards... You can add
> ARP Odyssey whiteface mkI, OB-Xa, and OB-8 (if you adjust the 2-pole res trimmer
> to osc)...
>
> Doug
> synthparts.com
>
>
>
> ----- Original Message ----
>> From: Andrew Simper <andy at cytomic.com>
>> To: synthdiy diy <synth-diy at dropmix.xs4all.nl>
>> Sent: Wed, February 20, 2013 6:41:24 PM
>> Subject: Re: [sdiy] Analog synths with 2 pole filters
>>
>> 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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