Dual State Variable Filters connected in series to product a total of 6 outputs. High Pass, Low Pass 1, Low Pass 2, Variable Bandwidth Output, Low Band, and High Band.
From the original catalog:
"The VARIABLE BANDWIDTH FILTER (VCF2) has a band-pass output which can
be varied manually or with voltage control . This is a standard
response synthesizer VCF, typical to filters used in many studio
systems . In the VCF2, two state-variable VCF's are connected in series
to produce a total of five outputs. High pass, low pass, two fired
bandwidth outputs . and one variable bandwidth output are available.
The outputs are all flat-response (no resonance) so the VCF2 is
suitable for processing concrete sounds without introducing resonant
coloration to the timbres . Under voltage or manual control, cut-off
frequency of the high and low-pass outputs are affected, as well as
the center frequency of the two band-pass outputs. Both center
frequency and bandwidth are independently controllable on the variable
bandwidth output."
