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VCF (VOLTAGE CONTROLLED FILTER)
The Filter is selectable between a classic Moog 24dB/Octave Low Pass Filter with Resonance and
a classic Moog 24dB/Octave High Pass Filter.
CUTOFF
Use this control to change the Filter’s Cutoff frequency from 20Hz to 20kHz.
In LOW PASS mode, only frequencies below the selected Cutoff frequency are
allowed to pass through. Turning the CUTOFF control to the right will open the
Filter, creating a brighter sound. Turning the CUTOFF control to the left will
close the Filter, creating a darker and thicker sound.
In HIGH PASS mode, only the frequencies above the selected Cutoff frequency are
allowed to pass. Turning the CUTOFF control to the right will remove low frequency information, creating a
bright and cutting sound. Turning the CUTOFF control to the left allows low frequency information to pass
through, creating an extremely bright, aggressive and full sound.
VCF MODE
This switch selects between LOW PASS and HIGH PASS Filter modes.
LOW PASS
The Low Pass Filter is a traditional Moog 24dB/Octave resonant Ladder Filter.
This is the heart of the Moog sound and is ideal for bass sounds and other
sounds that mimic melodic acoustic instruments.
HIGH PASS
The High Pass Filter is a classic Moog 24dB/Octave non-resonant Ladder Filter. This is useful for
bright sounds that cut through a mix, or dynamically removing bass frequencies to thin the sound.
NOTE: In HIGH PASS mode, if the RESONANCE control is turned up at all, the High Pass Filter will
NOT function fully as this will reintroduce bottom end into a sound, which may or may not be desired.
TIP: You can provide resonance in HIGH PASS mode by patching the VCF output into the EXT. AUDIO
input. The MIX control then becomes the resonance control for the High Pass Filter, even increasing to
self-oscillation. For this to work, keep the RESONANCE panel control turned fully counterclockwise.
TIP: With the CUTOFF control at minimum in HIGH PASS mode, you are basically bypassing the Ladder
Filter and passing the output of the mixer straight to the VCA. If you are looking for the pure sound of
the VCO, this is a way to get it without patch cords.
RESONANCE
The RESONANCE control determines how much signal is routed from
the Filter’s output back to its input. Turning it clockwise causes a peak in
amplitude at the Cutoff frequency. Settings above 3 o’clock will cause the
Filter to self-oscillate allowing the Filter to be used as a sound source.
TIP: In LOW PASS mode, with the RESONANCE and MIX controls at maximum,
the VCF can be used as a Sine wave sound source. Simply patch the KB output
to the VCF CUTOFF input, and patch the VCF output to the EXT. AUDIO input.
Now adjust the Filter CUTOFF control to ne-tune your new oscillator.
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