This area is for setting cue in, cue out, intro, outro, xfade. You can edit this properties only in Edit mode, and it saves modifications only when pressing Save.
Setting up cue points:
You can define unlimited number of cue points, so you can easily start playing on the specified positions. During play, use the "Add point" button to add new cue point. Double click on a cue point to modify its properties.
Wave form