
18.1. AUTO FILTER 237
18.1 Auto Filter
The Auto Filter Effect.
The Auto Filter effect provides classic analog lter emulation. It can be modulated by an
envelope follower and/or an LFO to create moving lter effects.
There are four different lter types: low-pass, high-pass, band-pass and notch. For each
type, the X-Y controller adjusts frequency (to adjust, click and drag on the X-axis) and Q
(also called resonance; to adjust, click and drag on the Y-axis). You can also click on the Freq
and Q numeric displays and type in exact values.
Low Q values create a broad lter curve, while higher values introduce a narrow, resonant
peak to the sound. With band-pass ltering, Q sets the bandwidth of the passed signal.
The Quantize Beat control applies quantized modulation to the lter frequency. With Quan-
tize Beat off, frequency modulation follows the control source. Turning this feature on
updates the lter modulation rhythmically with stepped changes that track the master
tempo. The numbered buttons represent 16th notes, so, for example, selecting 4 as a
beat value produces a modulation change once per beat.
The Envelope section controls how the envelope modulation affects the lter frequency.
The Amount control denes the extent to which the envelope affects the lter frequency,
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