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The Phaser effect gives a swirling "whooshing" quality to the sound.  It works by mixing the original signal with a signal that has its phase modulated by an LFO (low frequency oscillator) which creates notches that move back and forth across the frequency spectrum.  It uses all-pass filters to create the phase shift, where a flanger does it by delaying the audio signal.

Effect Variation - 1. Has a rate and a right channel phase control.  2. Has left and right rate controls.

Frequency - The pitch of the notches.

Resonance - The amount of the output signal that is fed back into the input.  Increases the strength of the phaser effect.  Negative numbers invert the feedback signal.

Stages - The number of stages.  4, 6, 8, 10 and 12.  It takes two stages to make one notch.  So for example, four stages would have two notches.

LFO Rate - The speed the phase is modulated.

LFO Sync - Synchronizes the LFO with the tempo.  Available in the multitrack editor only.

LFO Depth - The amount the phase is modulated.

LFO Phase - The phase difference between the left and right LFOs.  90 degrees is common for a stereo effect.

Stereo Spread - The width of the stereo image.  Negative numbers swap the left and right outputs.

Dry/Wet - The balance between the dry and wet signals.