With the normal panning, if you pan hard left, the sound appears to arrive from the position of the left speaker. With Extra Pan, you can place the sound further outside.

Extra Pan outputs the phase-inverted signal from the opposite side speaker. For example, if the sound is placed further outside of the left speaker, a phase-inverted signal is output from the right speaker.

If the sound is converted to mono, the left and right sound interfere, and the sound becomes smaller or disappears completely. For this reason, the out-of-speakers technique should be applied to the less important instruments for a short time.