Can you clarify what you mean by masking between tracks? I "think" you mean 3D masking, as in showing one frame "in front" of another and blocking some of the frame in back.
Ooops !) Sorry for my english. I mean masking like in LD2000 Pro. When I put frames on track 1 and put frames on track 2 and make track 1 mask for track 2. Can I do it in BEYOND Ultimate ?