CHAPTER 21. LIVE AUDIO EFFECT REFERENCE
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21.13
Flanger
The Flanger Effect.
Flanger uses two parallel time-modulated delays to create anging effects.
Flanger's delays can be adjusted with the Delay Time control. The Feedback control sends
part of the output signal back through the device input, while the Polarity switch ( + or
- ) sets the polarity. Delay Time and Feedback can be changed simultaneously using the
effect's X-Y controller.
Periodic control of delay time is possible using the envelope section. You can increase or
decrease the envelope amount (or invert its shape with negative values), and then use the
Attack and Release controls to de ne envelope shape.
Flanger contains two LFOs to modulate delay time for the left and right stereo channels.
The LFOs have six possible waveform shapes: sine, square, triangle, sawtooth up, sawtooth
down and random. The extent of LFO in uence on the delays is set with the Amount control.
LFO speed is controlled with the Rate control, which can be set in terms of hertz. Rate can
also be synced to the song tempo and set in meter subdivisions (e.g., sixteenth notes).
The Phase control lends the sound stereo movement by setting the LFOs to run at the same
frequency, but offsetting their waveforms relative to each other. Set this to 180 , and the
LFOs will be perfectly out of phase (180 degrees apart), so that when one reaches its peak,
the other is at its minimum.
Spin detunes the two LFO speeds relative to each other. Each delay is modulated at a
different frequency, as determined by the Spin amount.
