Unless you have a meaningful input signal, nothing else matters…

When you say "I have a mic plugged in", do you mean that you plugged a regular microphone into the XLR ? If, so, this is your problem. A regular microphone has a very low output level, and will not work into a line level input like that of the Orville. You need to use a mike preamp, or a send from a mixer, to get a suitable line level signal.