Enable Sound
By default, sound is enabled. You might want to turn the sound off to improve responsiveness and improve download time.

Add sound to drop down vocabulary lists
When this option is selected, you can hear the pronunciation of the words within the supplementary vocabulary list by placing the cursor over them. If you are using Windows Media Player there wil be a slight delay before the sound initially plays.

Media Players
Quicktime 6 is best in terms of sound quality. Currently Real Player should not be used.