[sdiy] 36dB VCF output drop while increasing emphases

[Harald]

I don't see that on this schematic. The second OTA is used as VCA for 
the output of LP4.

Am 18.04.2015 um 19:15 schrieb Chris McDowell:
> You might try what Olivier from Mutable did on "Ripples"
>
> http://mutable-instruments.net/static/schematics/Ripples-v01.pdf
>
> The input goes through the same OTA controlling feedback for resonance.
> Perdy clever!
>
> Threeler sounds amazing, Ian. I'll have to give it a go someday :)
>
> Chris
>
>> On Apr 18, 2015, at 11:14 AM, Ian Fritz <ijfritz at comcast.net
>> <mailto:ijfritz at comcast.net>> wrote:
>>
>> The topology of the filter and its nonlinearities are what gives it
>> its wide range of capabilities. The operation seems quite sensitive to
>> OTA non-idealities (eg, offsets) which is why I recomment the CA3280.
>>  I think it could work quite well if the 13700 were used, but probably
>> the very low end (in self-oscillation) would suffer.
>>
>> Ian
>>
>> At 03:32 PM 4/17/2015, Harald wrote:
>>> Well it uses 3280 OTAs. I still have some around but never used them.
>>> Might be time to change this. Anything else special in this filter?
>>> Or does the 3280 make the sound quality alone?
>>>
>>> Am 17.04.2015 um 21:56 schrieb Ian Fritz:
>>>> I'm partial to 3d order, musically.  My 3d order filter has four
>>>> switchable combinations of HP/LP stages and output from each stage.
>>>> Demos may be heard/seen here:
>>>> http://home.comcast.net/~ijfritz/MiscProj/Threeler.htm
>>>> http://bridechamber.com/Threeler_PCB.html
>>>> https://www.youtube.com/channel/UC8mKuBoR8bfHTLYRJ1sl0RA
>>>>
>>>> Several people have said this is the all-time best-ever filter. I don't
>>>> know about that -- I've always been more interested in the waveshaping
>>>> approach to timbre -- but please listen and see what you think about the
>>>> musicality.
>>>>
>>>> Ian
>>>>
>>>>
>>>> At 06:08 AM 4/17/2015, Harald wrote:
>>>>
>>>>> Second thought: The filter works quite good. Does it make sense to go
>>>>> for 48dB musicaly?
>>>>
>>
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>