LoopTracks are identified by letter. The Letter displayed in a LoopTrack is also a control.
Double click on the Letter to toggle the LoopTrack from thinnable to unthinnable.
Right drag and drop on another LoopTrack to fade down the source of the drag and fade up the target of the drop. See Cross Fadingfor more.
Drag and drop on a control in another LoopTrack to copy the value of the target control into the source LoopTrack. For more, see Dropper.
Also see: Doing Things with LoopTracks