CHAPTER 21. LIVE AUDIO EFFECT REFERENCE
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periodic fashion. The respective Amount control sets how much the LFO affects the lter.
This can be used in conjunction with or instead of the envelope follower.
The Rate control speci es the LFO speed. It can be set in terms of hertz, or synced to the
song tempo, allowing for controlled rhythmic ltering.
Available LFO waveform shapes are sine (creates smooth modulations with rounded peaks
and valleys), square, triangle, sawtooth up, sawtooth down, and sample and hold (generates
random positive and negative modulation values) in mono and stereo.
There are two LFOs, one for each stereo channel. The Phase and Offset controls de ne the
relationship between these two LFOs.
Phase keeps both LFOs at the same frequency, but can set the two LFO waveforms out of
phase with each other, creating stereo movement. Set to 180 , the LFO outputs are 180
degrees apart, so that when one LFO reaches its peak, the other is at its minimum.
Spin detunes the two LFO speeds relative to each other. Each stereo channel is modulated
at a different frequency, as determined by the Spin amount.
For sample and hold, the Phase and Spin controls are not relevant and do not affect the
sound. Instead, the Auto Filter offers two kinds of sample and hold: The upper sample and
hold type available in the chooser provides independent random modulation generators for
the left and right channels (stereo), while the lower one modulates both channels with the
same signal (mono).
21.2
Auto Pan
The Auto Pan Effect.
