I am setting up my Presonus StudioLive AR16 USB and don't get a signal in Studio One 4, on the stereo inputs 9 - 16. The mono inputs 1 - 8 work just fine. If I plug in a mic (or output from stereo mTC Helicon Voice Live extreme 3) nothing. And of course I can use the mono channels to create stereo tracks, but I would like to get it working. Anyone suggestions please?