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The re-assembly of two distinct sound sources (stereo) into a coherent canvas of sound occurs in the brain. The effects of this imaging on an individual person cannot be measured. However, the sounds CAN be measured accurately. How do you think a recording studio works? That same acoustic energy that you're hearing -- as interpreted by your speakers -- once emanated from an instrument and passed into a microphone before it was digitally written to the CD in your Ah! Njoe Tjoeb player.