direct operation
volume
press volume (+/–) button(s) on top control or on remote control unit to adjust volume. volume dialog box appears. (+) button to increase volume, and (–) button to decrease volume.
mute
press mute button on remote control unit to cut off sound. to restore sound to its previous level, press mute button again or press volume (+/–) button(s).

menu operation
1 press menu button and on-screen menu will appear. press point left/right buttons to move a red frame pointer to sound menu icon.
2 press point down button to move a red frame pointer to the tem that you want to select, and then press set button.