Setting up a new UR44. I’m running audio out of an iPad. The Hi-Z inputs work fine, but the 3 through 6 line inputs don’t pass the signal through to the DAW via USB. The DSPmixer shows a good level signal entering the UR-44 from the line-ins to the master outputs of the mixer (just like the Hi-Z), and the signal is passed through to the audio output of the UR44. But, not through the USB. ???