[sdiy] 4 Pole state-variable filters

[The Proteus]

Actually, I haven't considered much... just looking for input. I almost
forgot, but I'd like to do a discrete filter, not one based around CEM or
SSM chips. Finally, I'd like to apologize for some miscalculation in my
original post... I believe I put in 12dB/Oct in the message, which is
totally incorrect for a 4-pole filter. I was totally dead last night.

Thanks for all your help, I'm researching all of it. :-)

Regards,

Prot

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On Sun, 10 Feb 2002, Steve Ridley wrote:

> 
> Have you considered variations of the Oberheim Xpander 
> VCF?  It's not state-variable, but if you replace the output 
> switching with individual mixer opamps you can have a 
> whole range of LP, BP, HP, notch and allpass outputs.  If 
> you replace the CEM3372 with a 3320 (noting the level 
> differences at the filter taps), you can mix in the input signal
> to increase your range of options.
> 
> I don't have the URL right here now - try google...
> 
> 
> Steve Ridley
> 
> 
>