:see_also=index:see_also=firfilter

The flange filter applies a reverb
with a varying delay, resulting in
"swooshing" sounds.

The flange filter has a display area
similar the the fir filter's, into 
which echoes can be placed and
relocated.  However, note that 
multiple echoes will greatly increase
the instability of the filter.

The echoes are varied according to
a sine wave, triangle wave, or
buffer.  The frequency of the this
waveform can be adjusted with the 'hz'
slider.  The lowest, center, and
greatest values can be set with the 
three horizontal sliders.

The overall amount of effect applied 
is controlled with the 'effect' slider.
