Simple gain width
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 @Christoph-Hart What happens (sonically) when the simple gain width is set past 100%? 
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 So, what does it do ? 
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 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. 



