I found it! I am running six discrete analog lines into the receiver, as I had already figured out the digital issue. The missing link was what I just found in the receiver’s manual. There’s this tiny little asterik in the Kenwood manual that refers to another section of the input selector that tells it if the signal is digital or analog. Once I switched it to analog, it all worked. I have highlighted this note in red!
Once I switched it to analog, it all worked. 
I have highlighted this note in red!