Yesterday I hooked up a USB gaming headset to my Mac.  The audio from my voice made it into the radio and I actually talked to another amateur radio operator over the air!  And  I did not hear my voice coming back at me through the headphones, so there is no chance of feedback.  This all works.  Thanks so much for the help.  I will be writing a set of tech notes for the amateur radio community on  how to integrate a Raspberry Pi, NoMachine, and a transceiver.  When I have this done, maybe in a few weeks, I’ll submit it to NoMachine for review to make sure I am using your product correctly.
I took my iPad to a local coffee shop today and connected to my station through their wi-fi network.  I made high frequency contacts with Germany and Belgium using a digital mode named FT8.  Lots of radio fun.  I was able to hear the audio received from my station clearly on my iPad.  The day before I took my iPad to a Starbucks and made a Morse Code contact.