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Probably doesn't matter how well these sync up--though they're likely better with a rhythmic wobble than an arhythmic wobble.
Update, whoa--just saw these on Internet Explorer (I've been using Firefox). They're very much in sync even though two of them are set at 10 frames per second (22 frames in all) and the other two are set at 20 fps (and 24 frames). Further update: I was wrong about IE--I'm getting random behavior with it now.