The Sounds page lets you assign sound files to be played whenever certain events occur in Opus. Sound events can be enabled or disabled globally with the Enable Sound Events checkbox at the top of the page. When enabled globally, individual sound events can also be enabled or disabled with their own checkboxes.
To assign a sound to an event, select the event in question and then use the Browse button at the bottom of the page to choose the .wav file you want to use. You can preview the sound using the play / stop controls on the right.
The events you can assign sounds to are: