56 Filters
Groove Synthesis
ENV AMOUNT: (-127 to +127) Sets the amount of modulation from the
lter envelope to the lter’s cutoff frequency. Any setting above zero
means that each time you strike a key, the lter envelope controls how
the lter opens and closes. Higher amounts more dramatically affect the
cutoff frequency. This control is bipolar. Positive settings produce standard
behavior. Negative settings invert the envelope.
VELOCITY: (0-127) Allows key velocity to inuence lter frequency. When
the velo to env parameter is set to on in the Filter’s misc menu The
harder you play, the more the lter will open and the brighter the sound
will be. This control makes for more touch-sensitive sounds.
To hear the effect of the lter:
1. Recall the Basic Program by pressing the global button and using soft
knob 1 to navigate to the set init program command, then turn soft
knob 2 (go).
2. Hold down a note and rotate the lter’s cutoff knob. Notice how it cuts
the high frequencies as you rotate counter-clockwise, making the sound
of the oscillator less bright. If you turn the cutoff knob fully counter-
clockwise you’ll lter out all frequencies and hear nothing.
3. Return the cutoff knob to its halfway position, hold down a note again
then turn the resonance knob about halfway up.
4. Rotate the lter’s cutoff knob again and listen to the sound change as
a band of frequencies near the cutoff is amplied. This how to create a
classic resonant lter sweep.
In the previous example, you controlled the lter cutoff by hand. In most
cases, you will use the Filter Envelope to do this. To learn more about the
Filter Envelope, see “Filter Envelope” on page 57.
Exploring the State-Variable Filter
As its name suggests, the State-Variable lter can change its operational
mode/state from low-pass, to notch, to high-pass, with a separate Band-
Pass mode that you can activate using the
bp (band-pass) button. This
makes the State-Variable lter very versatile.
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