Volume; Pitch - Nikon Z 8 Reference Manual

Volume

Adjust beep volume and the volume of the shutter-release sound.

Pitch

Choose the pitch of the beep from [High] and [Low]. The pitch of the shutter sound cannot be
changed.
D
Silent Mode
Selecting [ON] for [Silent mode] in the setup menu disables the shutter-release sound and beep
speaker.
D
Caution: Camera Sounds
Overlapping beeps and/or shutter sounds may play as a single sound.
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Camera Sounds