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ZERO CROSSING or ZERO GRAVITY POINT the point where the polarity of an electrical or sampled signal changes from positive to negative (or vice-versa) as it passes through zero. A zero crossing provides a convenient point to splice two sounds because the levels of the two splice points are the same at zero volts...In a case where two stereo tracks are being cross-faded...(One track fading in louder, as the other fades out)...the Zero Gravity Point is the place where the volume of the two tracks is identical.