Things You'll Need
Instructions
Adjust the Sound Settings
Use the direction arrow keys to move to the Sound icon on the Home menu icon, then use the "X" button to confirm your selection.
Limit the maximum volume by choosing "AVLS On."
Choose the "Key Tone Off" setting if you want to mute the sounds that are made when you press buttons on the PSP.
Adjust the Tone
Use the Sound button to adjust the tone of the PSP sound.
Press the Sound button repeatedly to cycle through the different tone qualities: Heavy, Pop, Jazz, Unique and Off (this is the default setting).
Press and hold down the Sound button if you want to mute the sound on your PSP. You can turn the mute function off by pressing the Sound button again.