AW: four-pole state variable filters

[Hugo Haesaert]

Hi Juergen, Martin and All !

If and when one uses two filters (a la MS20) or three (a la Syrinx) 
the thing is that the resonance peaks of each can be put at different 
freqencies, imo far more musically useful than fixed BP which has 
only one peak .

One of the Synthesource issues from Barry Klein's book has a 
schematic for such a filter using the CEM3350 dual svf (HP+LP) .  One 
voltage governs the center freq, another the bandwith, the two 
resonances are independent .  Tracking should be ok here, as both 
filters sit on the same substrate in the chip .

BTW, got any leads to a schematic for that 4pole svf ?

As always, curious ;-)


Keep 'em oscillating :)


Hugo
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