Pioneer Dj DJM-A9 4-Channel Digital Pro-DJ Mixer with Bluetooth (Black) - Manual (Page 30)

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Audio output
• Only the left channel sound of stereo audio is output when set to the [ L ] (leftmost)
position, and only the right channel sound is output when set to the [ R ] (rightmost)
position.
5 Press the [TAP] button.
• To cancel the setting, press the [ AUTO/TAP ] button.
6 Press the [QUANTIZE/UTILITY (WAKE UP)] button.
The [ UTILITY ] screen closes.