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Find some presets you like. Take notes on the parameters. Compare 
them. Notice some use oscillator sync and some don't. How does it 
sound? Find a preset that's close to what you want, and try changing 
one little parameter-even if you don't have a clue what you're doing. 
Experiment, goof around. This technique is extremely addictive and 
whole afternoons can vanish in seconds while you play with sounds.

Rainbow Jimmy
http://www.spaceanimals.com
http://www.mp3.com/spaceanimals