do you need to reboot to save audio level changes?

[fud]

Pacman and a few others are very loud compared to some games.
I lowered the sound in the audio setting and it said saving it.
When I turned it back on the next day, the sound was loud again and the settings hadn't saved.

Does this require a reboot so the sd card saves the information?
If so, could someone please let me know how you reboot this?
Thank you

[dee2eR]

You can reboot from the service menu (either cabside 'service' or keyboard 'f4' from the game select menu).

[fud]

Thank you very much for your help.