via Oakley where you'll find more info. A snip for the archvies:"The Oakley Croglin Voltage Controlled Filter is based around two unusual and quirky low pass filter circuits that operate either together or against each other.
The filter design is inspired by a peculiar low pass filter topology first seen in a portable synthesizer from the late 1970s. For the Croglin VCF I have completely redesigned the circuit to produce a stable, lower noise design that unlike the original covers a much wider frequency range and gives the user far greater control over the parameters of the filter.
The cut off frequency of each filter can be controlled by a common control voltage and the front panel's Frequency pot. The second filter's cut off frequency can also be offset from the first. This can be done with either the Offset pot or an offset CV. The offset can be both positive, making the cut off frequency of the second filter higher than the first with a positive input CV, or negative, making the frequency lower than the first.
The two filters work in parallel on the audio input signal. The output of the first filter is then passed directly to the output but a proportion of the second filter may be added or subtracted from this. The level of the second filter is controlled by the Duality pot. In the middle position the Duality pot allows no audio to come from the second filter. Fully clockwise the second filter is added to the first filter's output. Fully anti-clockwise the second filter's output will subtract and cancel out those parts of it that are common with the first's output. A wide variety of tonal responses can be made; from the traditional low pass filter and band pass sounds to complex vocal like formants."
Croglin VCF Demos by Takla Makan
"These are some demonstration tracks made with the Oakley Sound Croglin VCF. The set up is a standard synth with two VCOs, one VC-LFO, one Croglin VCF, a couple of Multimixes and a couple of ADSR/VCAs.
In all of them the Croglin is both manually tweaked and automagically tweaked by either the LFO or the ADSR."
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