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.

APPENDIX E 359