24 | The Voltage Controlled Filter (VCF)
FILTER PARAMETERS
CUTOFF (Cutoff Frequency)
This knob sets the value of the Filter’s Cuto frequency, from 30 Hz–20 kHz.
Simply put, harmonic content above this Cuto frequency is filtered out, and
the harmonic content below this Cuto frequency is allowed to pass.
As the knob is rotated counterclockwise, the sound gets “darker” as more
upper register components are filtered out. Rotating this knob clockwise
allows more upper harmonic content to pass, creating a “brighter” sound.
The Voltage Controlled Filter (VCF)
Mavis utilizes a low-pass audio filter that selectively removes harmonic content to modify the
timbre of your sound. Unlike selecting a wave shape, where timbre is determined based on
individual harmonics that make up the wave, the Voltage Controlled Filter (VCF) changes the
timbre by blocking certain frequencies of the overall sound, or by allowing them to pass, and
also by adding resonance. The top row of knobs controls the Filter parameters; the second
row of knobs are used to apply modulation to the Cuto frequency.
NOTE: The Filter is of the classic 4-Pole Moog Ladder design, providing -24 dB of attenuation (per octave) to
harmonic content above the Cuto frequency.
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