http://www.fm8tutorials.com/growl
Included in the toolkit we have 70 howling bassline patches as well as 6 video tutorials on patch creation, effects tweaking (including some great tips on using envelopes to add dynamic evolution and harmonics to your sounds) through to how to use the morph grid and deep modulation of parameters within FM8. Not only this, but there's also another 3 bonus video tutorials specifically on creating that growling Skrillex style bassline!
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