 One of the major features on Mark III cannot be seen directly from the front. It's on the rear panel But this is the addition of cab rig technology This is something we've introduced into several other products over the last few years And it's the easiest way to get great recorded tones out of your valve amp And also for live use as well. In addition to cab rig technology We've also improved the actual electronics that drives these outputs. This is the headphone output Which has now been increased in level and also the XLR DI output Which has been given a proper professional type balanced output