L-1 Sallen Key Filters. Mutant Cure VCF vs. DS VCF.

video upload by Aleksei Laman

"L-1 Synthesizer makes two Sallen-Key filters.

Mutant Cure VCF is optical, based on vactrols.
DS VCF is solid-state, based on original L-1 discrete gain cells.

In this video I split input waves and modulations between these filters.
I play them by one and both together.

Mutant Cure VCF has correct Sallen-Key LP mode. HP mode is mutant-ish, it has not so nice timbre as it must be and no selfocillation.

So I play this filter only in LP mode.

DS VCF has correct Sallen-Key LP, BP, HP modes. It switches between LP, BP, HP topologies using sophisticated switching system with 12 electronic switches.

Also it has voltage control on resonance and Drive knob which adds gain to the input.

Mutant Cure VCF sounds more blurry. It's not a flaw, it's a feature of vactrols, for that we love them.
DS VCF sounds cleaner and faster, especially on trebles. Also it has more convex resonance.

L-1 Synthesizer website: http://L-1.su/

00:00 Intro
00:25 Sample 1
04:55 Sample 2
09:34 Sample 3
14:45 Sample 4
19:14 Sample 5"