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Audio, Video, and the controls are communicated through this port from the iPod to the mixer. REFERENCE DRAWING FOR FRONT PANEL FRONT PANEL FUNCTION 5) PLAY/PAUSE This button plays and pauses music from the iPod. 6) PREVIOUS TRACK Use this switch to re-start the track or to select the last track. 7) NEXT TRACK Use this knob to select the next track. 8) GAIN ADJUSTMENT Each channel as a gain adjustment which is used to level between sources. This is very useful when working on MP3 files