Snap To Zero-Crossing in the submenu.

Turn on Snap To Zero-Crossing to reduce pops and clicks caused between edit points. When editing, it is important that the waveform not change suddenly from one amplitude to the next, otherwise a click will occur. This can happen when deleting the selection. The amplitude of the waveform at the start marker may be completely different from the amplitude at finish marker. After deleting the selection, these two different amplitude will be adjacent, causing a click.

Snap To Zero-Crossing helps minimize the problem by ensuring that the markers are always near zero amplitude samples. When you drag and release a marker, it is automatically moved to a position where the amplitude approaches zero. This means that when you delete the selection, the amplitudes at both the start and finish markers will be more closely matched (near zero).

Since stereo and multichannels sounds can have very different channel amplitudes, finding an ideal zero-crossing position may not be possible. Use the menu to limit the snap feature to a single channel or use the "Sharp faded ends" preset in to force the ends of the selection to have zero amplitude (the unselected ends will have to be faded when deleting the selection).

If the zoom level is close enough that the true shape of the waveform is shown (such as ), the snap feature is automatically turned off so that markers can be placed at any position.