All the alarm sounds in this script can be changed to whatever you would like. I left some default alarms to give examples. I like to have different alarms to tell me what is being collected and the best hits should get a long and powerful sound to grab your attention. The lowest hits should just be a simple sound to grab a little attention. Clicking on the change button will show a choose file button which will bring up a file browse dialog so you can choose a sound file. The only limit for this file is the size must be under 6mb. There isn't a limit to the length of the audio but try to keep it under 20 seconds so it doesn't go too long.
You can also change when the alarm will sound on reward amount and/or duration minutes allowed. Sometimes when the script gets first installed and tries to load up the default sounds it might not be able to grab them. This is usually a browser restriction or the server with the audio files might be having problems. The script actually loads up the sounds and places them in memory. It will also save the sounds on your computer in the local storage of your browser. This keeps the sounds fast and doesn't need servers to be up for the sounds to work.
If the sounds didn't get loaded then you can click on the help text at the top in red to show the actual urls each sound file is at. You can go to each sound and save them to your computer. Then by changing each alarm to these sounds you can fix it or you can add your own.