21
Prophet-6 Operation Manual
Filters
High levels of resonance can sometimes cause the Prophet-6 outputs to clip
if its sound generators are also set to high output in the Mixer. Monitor your outputs
carefully to ensure optimal, clean signal levels. If you experience signal clipping, try
reducing the levels of the oscillators in the
mixer
section, the
env
amount
parameter in
the Amplifier Envelope, or the
resonance
parameter in either the low-pass or high-pass
filter.
Env Amount:
Sets the amount of modulation from the filter envelope to
the filters. Higher amounts more dramatically affect the cutoff frequency.
This control is bipolar. Positive settings produce standard behavior as
described in “Filter Envelope” on page 22. Negative settings invert the
envelope. Experiment with this control to create a variety of expressive
filtering effects.
Velocity:
on, off
—When enabled, allows key velocity to influence filter
frequency. If the
env
amount
is set to a positive value on the low-pass
filter, the harder you play, the more the filter will open and the brighter
the sound will be. Conversely, if the
env
amount
is set to a negative
value, the harder you play, the more the filter will close and the less
bright the sound will be. This control makes for more touch-sensitive
sounds
Keyboard:
off, half, full
—Sets the amount of modulation from the
keyboard to the filter’s cutoff frequency. Selecting
half
or
full
means
that the higher the note played on the keyboard, the more the filter opens.
This is useful for adding brightness to a sound as higher notes are played,
which is typically how acoustic instruments behave. If both
half
and
full
are off, keyboard filter tracking is off, meaning that filter frequency is unaf-
fected by playing higher or lower notes on the keyboard.
On the Low-Pass Filter, setting
keyboard
to
full
when the filter is self oscillating
will cause the filter-generated pitch to follow the keyboard in tune (i.e. in semitones).
Setting the
keyboard
to
half
will cause the filter-generated pitch to follow the keyboard
pitch in quarter tones.
