You probably don't need to manage is this Sound on/off switch
in the DB at all.
If the site has a place where users are required to log in,
use Session or Client variables to log them in, and then have a
Session/Client.soundOn variable that you set to on/off based on
what the user chooses in your form.
If there's no login for this site, you can use cfcookie to
set a cookie.soundOn variable.
Session, Client, and Cookie variables will give you the
user-specific variables capabilities you are looking for... it just
depends on the requirements and nature of your particular app as to
how you should handle the situation.