You can
Enable Sounds
by checking the checkbox next to individual program sounds. There is also a
Mute All Sounds
button on the Controller - Sound toolstrip to quickly toggle All sound on/off during play.
Game Buzzer Sounds
You can pick your own sound files which reside on your computer with the Browse buttons. The format can be any of the Windows Media Player (WMP) supported audio formats (MP3, WAV, WMA, etc). And by installing audio codecs you may extend beyond the usual formats supported by Windows. As a general rule, if the file plays with WMP, then it should work with this program. Windows has a selection of sound files in the C:\WINDOWS\Media folder. Or search the Web for free sounds effects that you can download. The Restore Default Values buttons resets to the original program sound files.