Sony Pro 10 User Manual page 365

Zero-Crossing
A zero-crossing is the point where a fluctuating signal crosses the baseline.
By making edits at zero-crossings with the same slope, the chance of creating glitches is minimized.
Zipper Noise
Zipper noise occurs when you apply a changing gain to a signal, such as when fading out. If the gain does not change in small enough
increments, zipper noise can become very noticeable. Fades are accomplished using 64-bit arithmetic, thereby creating no audible
zipper noise.
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