A lot of the games in the gamezone play sound when they start
If you do not wish to hear the sound, you can:
1. press ctrl + m (windows mute) or command + m (mac mute)
2. right click on the internet tab playing music and select mute
3. mute or turn down the sound on your computer speakers
The sound for all games in the "Game Zone" are as authentic to the original versions as possible.