trash:
I did read your description and that's the best summary I could make of it....
Basically you move a lever and it sets depth and keeps you there....right? The idea seems simple enough. Part diver (change volume) and part submarine (change density). But in order to control depth you'll either need some kind of depth sensing (because the diver's body will change volume when he breathes and thta will cause him to drift off the set depth). Or you'll need a counter lung or something along those lines. Unless I'm missing something then I don't see how it will simplify buoyancy control at all.... The diver still descends to a give depth, sets his buoyancy and controls fine tuning with his lungs..... right?
R..