Pioneer AVH-2400NEX Operation Manual page 111

Touch to mute. Touch again to cancel mute.
Touch [+]/[-] to adjust the guidance volume.
Displays the main sound volume. To adjust the main sound volume, press
VOL (+/-) on the unit or touch [+]/[-].
NOTE
The volume menu is displayed for four seconds. If the menu disappears, press VOL (+/-) again. The
menu reappears.
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