Onkyo LS-T10 - Mute Button

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1. z (ON/STANDBY) button
Switches the power on/standby.
2.
(Mute) button
Turns the audio off temporarily. Press again to cancel muting.
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The Status indicator flashes when the audio is muted.
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Muting will also be canceled when the volume is changed or the power is
turned off and on.