[sdiy] Synthancon VC-Resonance

[nathan settembrini]

Hi,
I am doing a project for the Theory of Music Synthesizers class at Georgia
Tech.  We have put together the Synthacon VCF filter (
http://www.cgs.synth.net/modules/cgs35_syntha_vcf.html) and are trying to
add voltage controlled resonance to the circuit.  We have tried using a JFET
as a voltage controlled resistor to replace the pot but think we were
overdriving the amp and getting a lot of noise.  The other thing we tried
was using a Vactrol to replace the pot, but can't figure out a way to get
the resistance low enough (without supplying rediculous amounts of current)
to replace the 1k pot.  Does anyone have any ideas?  Can the 2k2, 1k, and 1k
pot all possibly be scaled to larger values and the circuit still function
properly?  Thanks

Kyle
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