Press select on a channel. Press processing to right of screen. In upper left press on the gain knob area to get preamp page. On left side in 48v button. Press and hold a couple seconds to turn on 48v. Hope that helps.
Yes it does. You will find it on the touch screen after you select a channel. You will not see it if you have the main L/R selected. In order to engage it you must press and hold for about a second.