Syntheogen Guide

Flanger effect

Updated November 10, 2013

Flanging mixes a delayed copy of the signal back into the source. Because the delay is relatively short, this produces an effect called comb filtering, which emphasizes certain frequencies while attenuating others. The delay length is modulated with an LFO, causing the filter effect to sweep back and forth. The result is a swirling, liquid sound that was common in 60's psychedelia.

After setting the effect type to Flanger, you will see the following controls:

TRACK EFFECTS dialog with flanger

TRACK EFFECTS dialog with Flanger effect

LEN Sets the period of the flanger LFO, in beats, which controls the rate at which the filter sweep repeats. This corresponds to the rate knob on flanger pedals, but the direction is reversed.
DEPTH Sets the maximum delay length, and thus the strength and character of the filter effect. Low values are often more interesting; at high settings, the delayed signal begins to be perceptable as a separate sound of its own.
FEED Sets the amount of the delayed signal that is fed back into the delay. When FEED is zero, the flanger acts as a 'feedforward' comb filter, with relatively mild filtering effects. When FEED is non-zero, 'feedback' filtering results; this is a stronger effect that can produce ringing with percussive input. Negative values cause the delay output to be inverted before it is fed back, giving a slightly different sound.
OFFSET Sets the amount, in percent, by which the phase of the right channel LFO is advanced relative to the left. Non-zero values produce dramatic stereo effects.
MIX Sets the effect mix, in percent. At 100, the output contains only the delayed signal; this produces no flanging, but if FEED is set to zero, it can be used to add vibrato to the source. When MIX is zero, the output contains only the unprocessed source signal.

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