This is a picture of a Soundblaster soundcard. This is used to hear multimedia sound. Without a soundcard, the sound from the multimedia presentation cannot be heard.
Here is a closer look at the soundcard.
Here is a diagram of how to hoop up the sound for your computer
A good source of information for soundcards is the
Soundcard FAQ (Frequently Asked Questions).
Here are some examples of how sound can be manipulated (these sounds were made using the sound recorder in Microsoft Windows):
The mechanized voice was created with Goldwave v2.14
The music clip and helium voice were created with CoolEdit v1.51
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A Normal Voice 
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