Nikon D3X - Manual (Page 346)

320
U
d1: Beep
Choose [High] or [Low] to sound a beep when the self-timer is
used or the camera focuses in single-servo autofocus (note that a
beep will not sound if [Release] is selected for Custom Setting a2
([AF-S priority selection], pg. 306).
d: Shooting/Display
Option Description
y High
Choose the pitch of the beep
from [High] and [Low]. A
c
icon is displayed in the top
control panel and shooting
information displays.
z Low
Off (default) Turn the beep speaker off.
SHOOT
CUSTOM