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Flanger Speed and Excursion
In a digital flanger, the delay-line length is typically
modulated by a low-frequency oscillator (LFO). The oscillator
waveform is usually triangular, sinusoidal, or exponential (triangular
on a log-frequency scale). In the sinusoidal case, we have the
following delay variation:
where is the ``speed'' (or ``rate'') of the flanger
in cycles per second, is the ``excursion'' or ``sweep'' (maximum delay swing)
which is often not brought out as a user-controllable parameter, and
is the average delay length controlling the average notch
density (also not normally brought out as a user-controllable
parameter).
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