I did a second playthrough of Overture recently, and recalling Red and how annoying I found him, I opted to NOT grab the hand-held radio near the Power Room for the New Mining Area.
Throughout the rest of the game, Red continues to communicate with me through the non-existent radio, and the little text pops up, "The radio is transmitting."
Must be a powerful radio speaker if I can hear it from the communications room where I left it on the table.
Anyways, it's a minor bug, but I felt like I should bring it into the light.