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Mute Mutes the audio on the amplifier. The Mute mode is indicated by the channel LED flashing. Press again to cancel mute. Aux, CD, Tuner DAB, DVD, AV MD, Tape Mon The six source select buttons are used to change the input source to the amplifier. 540C/640C V2.0 Compact disc player OPERATING INSTRUCTIONS Loading and unloading discs 1. Press the Standby/On switch. 2. Press the Open/Close button. 3. When the disc tray has opened fully, place a disc carefully in the tray with the label side facing