Soundstage is a fantastic tool for creating and mixing audio sequences in VR. It gives you literally thousands of dollars worth of equipment, but is completely virtual, and takes up no space.  In Augmented reality, the effect is even better because I can see the space around me while I manipulate holograms. Having 6dof controllers in AR is incredibly useful. I find controllers to be more precise and responsive than hand gestures, although that may change one day. Controllers also give me haptic feedback which is very helpful when sensing when I press into the holograms.