Jensen VM9725BT Operating Instructions Manual page 214

You can control the volume of the following sound types:
Button
Controls for each sound type:
Button
Volume Slider
122
Description
This is the main volume control. These controls affect
all below sounds. They can also be accessed from the
Quick menu.
These controls affect the volume of the guidance
sounds (verbal instructions).
These controls affect the volume of the alert sounds
(beeps).
These controls affect the volume of the background
music.
Key sounds provide audible confirmation of tapping
the touch screen. These controls affect key sounds.
Description
Adjusts the volume of the related
sound.
Use the switch to mute the related
sound. The slider becomes inactive.
Tap again to re-enable.
VM9725BT