Note that the "Sound file" entry field on the right accepts multimedia wave files via drag and drop. Alternatively, you can press the "Browse" button to open a standard "File open" dialog.
The "Play" button allows you to play the sound displayed in the "Sound file" entry field. This button is disabled if the specified file does not exist.
The volume lever on the bottom right finally displays the volume which has
been set. If "Same volume for all sounds" is checked, this will always display
the same volume; otherwise, the individual volume for the currently selected sound
is displayed.