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Primus often has extremely unbalanced channels. This cancels out the vocals but leaves the rest in tact.
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Usually the vocals are put dead center, so we can split the stereo track and invert one channel. Sometimes the bass is pushed more towards the right channel, rhythm guitar might be found more towards the left, and so on. Vocals are normally placed in the “center channel.” Stereo tracks have two channels, but not all of the instruments are balanced evenly.
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