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Gently! Haha a lot of new players tend to always beat the crap outa that thing which ends up throwing their guitar out of tune. Try letting a chord ring out and then gently flutter the whammy.. its cool to end of some songs like this. If your a big whammy fan i'd check out an original German made Floyd Rose tremolo... (my fav!) Those things never go out of tune.

Thanks for the tip! Tried it with Hotel California (Eagles) and it sound awesome :D