Filter
O-DRIVE Knob
Controls how much the filter is overdriven. When used in large amounts it will have the effect of
making the sound richer and slightly distorted.
MOD ENV Knob
Controls the amount of change to the filter cutoff (set by the FREQUENCY knob) by the
Modulation Envelope.
In its central position there is no change to the filter cutoff frequency.
Adjusting the knob clockwise from centre will introduce an increasing amount of positive
modulation - the cutoff will rise through the MOD ENV’s attack and will fall through the MOD
ENV’s subsequent decay and release stages.
Adjusting the knob anticlockwise from centre will introduce an increasing amount of negative
modulation and the MOD ENV effect will appear to be ‘upside down’ (i.e. the attack stage of
the MOD ENV will force the cutoff frequency down and the decay’release stage will cause the
cutoff to rise or ‘open’’)
SLOPE LEDs
Controls how drastically the frequencies above the cutoff point are removed from the sound.
When the 12dB position is selected, the cutoff slope is gentle so higher harmonics are not
attenuated (reduced in volume) as sharply as they are when the 24dB position is selected.
12dB/Octave 24dB/Octave
Cutoff frequencyCutoff frequency
KEYTRACK Knob
Controls the amount of change to the filter cutoff (set by the FREQUENCY knob) by the pitch
of the note played. Set fully anticlockwise, there is no change to the filter cutoff frequency as
pitch increases. With clockwise movement there will be an increasing amount of modulation
and the filter will be opened more as higher notes are played on the keyboard. This control is
used to define how the timbre of a sound changes over the keyboard.
At the fully clockwise position, the filter tracks the pitch changes in a 1 to 1 ratio. This means
that with RESONANCE set to a high level, the pitch of the filter’s self - oscillation will increase in
semitone steps as notes are played on the keyboard. This effect is akin to adding an extra
(Sine Wave) oscillator to the sound when notes are played on the keyboard.
LFO2 Knob
Controls the amount of change to the filter cutoff (set by the FREQUENCY knob) by LFO 2. In
its central position there is no change to the filter cutoff frequency.
Adjusting the knob clockwise from centre will introduce an increasing amount of positive
modulation - i.e. the filter will open and close at a rate set by LFO2’s SPEED control.
Adjusting the knob anticlockwise from centre will introduce an increasing amount of negative
modulation - i.e. the filter will close and open at a rate set by LFO2’s SPEED control.
31 MAIN panel / Operation
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