Pulsers

Dual State Variable VCF

Dual 12 dB multimode state variable filter

Audiophile Circuits League · 26 HP · U3

DUAL STATE VARIABLE VCF
A
B
CV IN A
CV IN B
AUDIO OUT A
AUDIO IN
AUDIO OUT B
RES
CUTOFF
CUTOFF
RES
C
C
C
C
CUTOFF A/B
CV RES
CV CUTOFF
CV CUTOFF
CV RES
PAR
SER
FILTER
ROUTING
BP
LP/ HP
NOTCH
IN A
LP
HP
LP
HP
IN B
CUTOFF
1V/OCT
RES
CUTOFF
1V/OCT
RES
LP
NOTCH
HP
BP
IN A
IN B
BP
HP
NOTCH
LP

Panel · 132.1 × 128.5 mm Drag to explore →

Description

The ACL Dual State Variable VCF holds two 12 dB multimode filters, A and B, each with lowpass, bandpass, highpass and notch outputs, controlled separately or together.

Key features

  • The FILTER ROUTING switches set the two filters in parallel or in series
  • In series, the LP/HP knob moves the signal B receives from A from lowpass through notch to highpass; it also sweeps the NOTCH output between LP and HP
  • CUTOFF A/B shifts both cutoffs at once
  • Attenuverters on the cutoff and resonance CV inputs
  • All audio and CV inputs normalised from filter A to B, so a single input drives both
  • As two parallel filters, stereo effects on mono signals, from sweeping panoramas to wide stereo images

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