This unit now has a VU meter showing the signal applied. An XLR Balanced Line in, together with a PFL Stereo jack (internally summed) input, for sound desks and other monitoring feeds.
This is then mixed with your comms headset feed, so you can listen to the comms and the feed you are monitoring without swapping headsets.
This latest revision would not have been possible without the help of our audio professionals who require these and use them daily.