OK, so since I last worked on this issue, I attempted (and failed) to install SoundFlower (https://www.youtube.com/watch?v=4WU0LR2Iz1I). I eventually uninstalled it using the included AppleScript. Anyway, since I did this, and I don’t know that it was involved and, if so, how/why, I now see an ‘AirPlay’ choice in the Audacity output menu! AND, it works!
Thanks for trying to assist…don’t know why it’s now working whereas it didn’t before…I was on with AppleCare yesterday on this issue and they concluded it was probably an Airport Extreme issue but, now, who knows?!
Thanks again…David