The Link setting links the selected fade-out and fade-in curves of a crossfade. If you adjust one curve, the corresponding curve is also adjusted. This ensures that the resulting crossfade is an equal power or equal gain crossfade, depending on which one you select.
Recommended for material that is not phase coherent, as in the case of a crossfade between two completely different types of material. Use this option to avoid the volume drop that can occur with an Equal Gain crossfade. With this fade, you can Alt-click (Windows) or Option-click (Mac) the fade curve to reset it to its default shape.
Recommended for material that is phase-coherent or nearly phase-coherent, as in the case of a crossfade between identical clips/instruments (for example, a repeated drum loop). Use this option to avoid clipping that can occur when using an Equal Power crossfade. With this fade, you can Alt-click (Windows) or Option-click (Mac) the fade curve to reset it to its default shape.
Disables linking between the fade-out and fade-in curves, and lets you freely adjust them separately, including start and end points. This option also allows you to create custom crossfade shapes.
When Link is set to Equal Power or Equal Gain, you can edit only the fade-in portion of the curve, by pressing Alt (Windows) or Option (Mac) while dragging. To edit only the fade-out portion of the curve, press Control (Windows) or Command (Mac) while dragging.