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• Waveform buttons: Set the waveform type used by the Shift LFO on the left side or
Fade LFO on the right side. You can choose between triangle, falling and rising sawtooth,
square up and down around zero (bipolar, good for trills), square up from zero (unipolar,
good for changing between two definable pitches), a random stepped waveform (S&H),
and a smoothed random waveform for each LFO.
• LFO Fade Intensity slider: Controls the amount of Fade AB modulation by the Fade LFO.
Tip: LFO modulations are the key to some extraordinary effects that can be obtained
with the EVOC 20 Filterbank. Set up either completely different or complementary filter
curves in both filter banks. You can use rhythmic material—such as a drum loop—as
an input signal, and set up tempo-synchronized modulations, with different rates for
each LFO. Feel free to try a tempo-synchronized delay effect—such as Tape Delay—after
the EVOC 20 Filterbank to produce unique polyrhythms.
EVOC 20 Filterbank Output Parameters
The Output parameters provide control over the level and stereo width. The Output
section also incorporates an integrated overdrive (distortion) circuit.
• Overdrive button: Click to turn the overdrive circuit on or off.
Note: To hear the overdrive effect, you may need to boost the level of one or both
filter banks.
• Level slider: Controls the volume of the EVOC 20 Filterbank output signal.
• Stereo Mode pop-up menu: Sets the input/output mode of the EVOC 20 Filterbank. The
choices are m/s (mono input/stereo output) and s/s (stereo input/stereo output).
• In s/s mode, the left and right channels are processed by separate filter banks.
• In m/s mode, a stereo input signal is first summed to mono before being routed to
the filter banks.
106 Chapter 6 Filter Effects