This is a wonderful little tool which you can use to generate sound
effects for games (and cool sounds for your tunes to stay on topic!):
<http://www.ludumdare.com/compo/2007/12/13/sfxr-sound-effects-for-all/>
At the bottom of the post there is an SDL port which is easy to compile
for Linux.
Chris.
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http://mccormick.cx