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The
VCF is a tone-shaping module which processes the `raw' output of the
VCOs to provide a wide variety of different tone colours and amplitude
dynamics.
The
VCF has four filter functions. A low-pass filter with a rolloff of -12dB
per octave above the turnover point, a highpass filter with a rolloff
of -12dB per octave below the the turnover point, a bandpass filter
with variable Q and minimum slope of -6dB per octave on either side
of the centre frequency, and a notch filter. The turnover point - or
centre frequency in the case of the band filters - is the same for all
four filter functions, and can be varied by the application of a control
voltage.
The
VCF is a state-variable design with an exponential voltage-to-frequency
response set at 1Volt/Octave.The
unit has the following features:-
- CV Inputs (2)
- Signal Inputs (2)
- Outputs for
Highpass, Bandpass, Lowpass and Notch
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