User Manual
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 Amplier Envelope, or the resonance parameter in either the low-pass or high-pass
lter.
Env Amount: Sets the amount of modulation from the lter envelope to
the lters. 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
ltering effects.
Velocity: on, off—When enabled, allows key velocity to inuence lter
frequency. If the env amount is set to a positive value on the low-pass
lter, the harder you play, the more the lter 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 lter 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 lter’s cutoff frequency. Selecting half or full means
that the higher the note played on the keyboard, the more the lter 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 lter tracking is off, meaning that lter frequency is unaf-
fected by playing higher or lower notes on the keyboard.
On the Low-Pass Filter, setting keyboard to full when the lter is self oscillating
will cause the lter-generated pitch to follow the keyboard in tune (i.e. in semitones).
Setting the keyboard to half will cause the lter-generated pitch to follow the keyboard
pitch in quarter tones.