I'm using an AVSpeechSynthesizer in my app to synthesise text to speech and play it back on the iPhone's speakers. All works well.
After that I want to recognise the users speech and I'm using SwiftSpeech to do so. It uses SFSpeechRecognizer under the hood. Everything is good here too.
After that the output from speech synthesis (doing it just like before with AVSpeechSynthesizer) is really quiet.
And when the iPhone is connected to a bluetooth headset and it played back via the headphones fine, after doing the speech recognition, the audio output switched from the BT headset to the iPhone (again really quiet.)
I couldn't find anything about that online.
I don't know if sample code would be any helpful, let me know tho.