Mixer
OSC A & OSC B Knobs
Set the level of oscillator input to the FILTER.
Noise/Ext
Knob
Sets the white
noise level input
to the FILTER.
Noise is an
unpitched source
useful for effects
such as surf, wind
or cymbals.
When the top
panel external
audio input is used, noise is bypassed and this knob sets the level of external signal input to
the FILTER.
To get any sound out of the Pro-1, at least one of these three knobs must be turned up (unless
the filter is being used as a pitch source).
Filter
The FILTER module contains controls for the filter itself and for its envelope generator.
Cutoff Knob
Sets cutoff frequency for the 24 db/octave (4-pole) low-pass filter. It is rather like a tone
control. Cutoff is the
frequency below which
all elements of a signal
are let through. The
higher-frequency
components of the signal
(i.e. all those above the
cutoff frequency) are
suppressed. The higher
the knob is set, the higher
the frequencies that are
allowed through the filter.
Resonance Knob
Determines the amount of
filter resonance. As the
setting is increased from
0 to approximately 7 the
amount of resonance ("emphasis," "regeneration," or "Q") applied to those signal
components at the cutoff frequency will increase. The components far below the cutoff
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