"...C.F. Martin & Co. produced video of the new Martin OM six-string guitar with the revolutionary Babicz "Continually Adjustable Neck" system. This is the new Martin OMCRE model which features "on command" string action height adjustments by the player -- a patented system invented by Jeff Babicz. A simple, quick turn of the included Allen key behind the neck instantly turns this guitar into either a low action, delicate finger-style device, or a higher action aggressive strumming machine; and you the musician can make this adjustment at anytime without de-tuning...) [YT]