resonance in

[jorgen.bergfors at idg.se]

Yes, that's how you normally do it. I added voltage controlled resonance to my 
Formant 24 dB/oct VCF this way. I made a simple VCA from a CA3080 and a few 
other components. It was a simplified version of the Formant VCA. 

/Jorgen





MIME:aschrock at cs.brandeis.edu on 98-08-03 19.21.14
To:  synth-diy at mailhost.bpa.nl @ SMTP 
cc:  (bcc: Jorgen Bergfors/IDGSE)
Subject: resonance in 

Hi all,

I would like to have a VCF I'm building have a resonance input, since I
think it would lead to some versatile sounds. The res. feedback loop in
most VCFs is basically just a volume knob to control feedback, so I was
thinking I could replace the res. knob with a VCA, so that the "gain" 
knob
on the VCA would control the intitial resonance, _and_ you'd be able to
have a modulation signal in to control the res. I was thinking of using 
an
asm-1 VCA for this purpose since it's a simple design... maybe 
(hopefully)
it will overdrive the res. a bit at max res. and lead to an interesting
overdriven sound.. Hopefully not _too_ noisy at low resonance, though.. 

Has anybody done this using the method I described? Is there an easier
way? 

Andrew

| Andrew Schrock       |
| Network Programmer, Synthesizer and electronic music enthusiast |
| aschrock at cs.brandeis.edu      |