A single VCF (like the Korg Poly 800, Casio HT-700/3000) wouldn't be difficult. A couple of modular synthesizer parts (VCF, envelope, LFO, midi to CV/Gate) connected together properly (so that the envelope can be used for single/multiple triggering and the filter can track the highest played note) would give you essentially the same thing as the Korg/Casio synths with a single global filter. Of course, you won't be able to store patch data or use the 8-stage envelopes, and the filter comes after any amplification (no final VCA), but more sophisticated setups could be used for stereo filtering, state variable filters, etc. Possibly something like a Sherman Filterbank would already include this functionality (I haven't looked into it).
Anything fancier than that (filter data stored as part of the patch, 8-stage envelopes, per-voice polyphonic filtering, Prophet 5 "Poly Mod") would require you to re-engineer and rebuild everything from scratch- not something that can be "added on".
To: CZsynth@yahoogroups.com
From: yazzofever@yahoo.com
Date: Mon, 24 Sep 2007 06:44:21 +0000
Subject: [CZsynth] A VCF Casio CZ mod-could it be done?
Is it just a dream? Could it be done? I think the Casio CZ synths
with a VCF, like the HT 3000, 6000 would be amazing.
Has anyone ever dared think this to be possible?
Micah
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RE: [CZsynth] A VCF Casio CZ mod-could it be done?
2007-09-24 by Scott Nordlund