An effect that results from delaying an input signal for a short amount of time (a few milliseconds) and then mixing the delayed signal with the original signal. This creates a comb filter with harmonically related notch frequencies. If the delay time is varied, the notch filter sweeps back and forth, resulting in a distinctive “whooshing” or “jet plane” effect.The name flanging comes from the technique originally used to produce the effect in the 1960s; two tape machines were set up to record the same signal, and the engineer produced the effect by pressing on the flange of the supply reel on one tape unit to slow it down (hence delaying the signal) relative to the other one. (This method of producing the effect is now known as “tape flanging” and is seldom done nowadays, although it does produce a somewhat different sound than the more modern technique which employs a delay line.)

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