A crossfade is used to fade out a part of a sound and to fade in another part simultaneously.
The "crossfade" function is used on a cut mark only.
To do a crossfade :
•Click on the cut mark. It turns to orange and the "crossfade" function is displayed :
•Drag the cursor according to the kind of crossfade you want (light or strong). The more you drag the cursor to the right side, the stronger the crossfade is.