Per Boysen wrote:
Here's what you do in detail by a more technical description: Ch A: Reverse stereo channels. Ch B: Invert phase. Now, when two channels of reversed phase play back through the same playback channel they nullify each other and the sum is silence. BUT here we made one of them stereo reversed, which means that only the audio that is mono - i.e. middle of stereo image - becomes nullified. Merging A + B gives us a "hole in the middle" stereo image. The deepness of the black hole and the width of the experienced stereo field depends on how you set the levels of these two stereo busses. My finding is that 1 dB lower for the phase inverted Ch B works best for the music I do (-1 dB that is). Now enter Ch C, the "monofied" split, and fill up that hole in the middle with this one. If the orignal mix is good this should stay at 0 dB as Ch A.
So all of the trick is to make you hear the mix differently. There's no way to get the original mix back with that combination. It's almost an implementation of a regular "shuffler", but weirded up:adding A and B equally gives you the classic "sides" signal, ready to mix with the mono "center"...except that the whole result is now L<>R
reversed. well, if it works......it's good andy