@Christoph-Hart What happens (sonically) when the simple gain width is set past 100%?
Dan Korneff - Producer / Mixer / Audio Nerd
So, what does it do ?
It's a stereo widener.
Looking at the source it seems to be using mid/side control to alter the perceived width.
Here's some info about mid/side decoding/encoding of stereo signals.
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It amplifies the side signal (L-R). No pseudo stereo FX involved.