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Originally posted by zoomzoom Both these guys are right. It has to do with similar frequencies being very slightly out of phase, which cancels out some of the sound. A little nudge to better align the beats will solve this problem.

Actually its when they are precisely 180 deg opposite waveforms. I looked at this when I was at the auditory lab here at school. We created a simple sine wave and layered the same one over it except while one was rising, the other was falling. There was no sound. But it you moved one wave or the other either slightly forward or slightly backwards you get a louder sound.

Since this is due to the frequency, even if the volume of one of the frequencies is low, it will still cancell out the loud frequency. which is a bitch, but ya just gotta either nudge one of the tracks forwards or back, and hope for the best. Or leave the bass out one, then slam in the bass on the next track when you completely knock out the bass on the first.