Hi there,
I found out that since iOS 11 the Audio destination setting does not appear in the VoiceOver rotor. I find this useful when connecting to bluetooth speakers and, most important, my Yamaha sound bar. I usually connect to the bar, change the audio to my phone and control the bar via its iPhone app. I like this because I don't have to disturb others while they're watching something.
But as I said, since iOS 11 there is no such option in the rotor. When I go to VoiceOver preferences I can see that the rotor has the option to include or not in it, but when the external device is connected it does not let me choose the audio output.
Anyone has any ideas?