The stereo-width panner is not generally useful. In order to
change the azimuth, width has to be reduced, which usually leads
to comb-filter artifacts.
Equal power stereo, also matches the default mono to stereo panner
better than the stereo-width panner.
Last but not least, control surfaces only have an azimuth control
knob, without an easy way to reduce width, this leaves
the panner insensitive.
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