I just tried setting up an Airfoil instance to test out the new Airfoil Pro plugin. Indigo didn't add any speakers, despite Airfoil having five speakers (plus one speaker hidden using "Advanced Speaker Options…"). When I toggled speakers on and off in Airfoil, the Indigo log would show an error:
Airfoil Pro Error Unknown speaker found: 7FF71832BE40@Dining Room
I thought it might be because I had a speaker hidden, so I told Airfoil not to hide that speaker any more. Lo and behold, *that* speaker was suddenly added to Indigo, but none of the other ones were. So hid *all* the speakers and then unhid them all. One by one, as soon I unchecked the "hide" checkbox, the speaker would appear in Indigo.
So now I've got them all in there, but I thought you should know something's wrong in the initial discovery. I'm running Indigo 7.0.1/7.02 (client/server), Airfoil 5.5.1, and mac OS 10.12.2. Airfoil and Indigo are running on two different Macs.
Let me know if I can provide more details, logs, etc.