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Since : > the vocal is usually centered in the stereo mix (equal on both left and right : > channel), It does it by reversing the phase on one channel and then 'adding' : > the two channels together. The -vocal and +vocal cancel out. : > : > I'll keep my eye out for it. : : I've tried this, I can't remember which program of mine did it but I : can say it doesn't work. The vocals are still there, just real faint : but what it does do is distort the music. So bad you can't even sing : along to it.
The main problem here is that, even though the lead vocal is generally centered, the processing on it, especially reverb, will often not be. Thus, even if you are mostly, or even wholly, removing the direct lead vocal itself with this phase trick, the reverb from it may remain behind.
Also, some vocal processing tricks add other elements to what goes to the various sides of the stereo field for the lead vocal. For instance, sometimes I double the lead vocal and then copy the doubled track to an extra track, advancing one of those copies a little and putting the other one back a bit in time to get an overall fatter effect. Thus, the center-panned primary lead vocal would be removed with the phase trick, but the doubled version would not be because the portions in the left and right channels are slightly offset from one another.
One additional problem is that there are other things centered in the stereo
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