CHAPTER 21. LIVE AUDIO EFFECT REFERENCE 279periodic 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 species the LFO speed. It can be set in terms of hertz, or synced to thesong tempo, allowing for controlled rhythmic ltering.Available LFO waveform shapes are sine (creates smooth modulations with rounded peaksand valleys), square, triangle, sawtooth up, sawtooth down, and sample and hold (generatesrandom positive and negative modulation values) in mono and stereo.There are two LFOs, one for each stereo channel. The Phase and Offset controls dene therelationship between these two LFOs.Phase keeps both LFOs at the same frequency, but can set the two LFO waveforms out ofphase with each other, creating stereo movement. Set to 180, the LFO outputs are 180degrees 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 modulatedat 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 thesound. Instead, the Auto Filter offers two kinds of sample and hold: The upper sample andhold type available in the chooser provides independent random modulation generators forthe left and right channels (stereo), while the lower one modulates both channels with thesame signal (mono).21.2 Auto PanThe Auto Pan Effect.