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Ask Time:2018-01-31T01:29:18 Author:Marjan Shkurda
I found such info:
Important: The built-in speaker may be used only if no other eligible output ports (USB, HDMI, LineOut) are connected.
https://developer.apple.com/library/content/documentation/Audio/Conceptual/AudioSessionProgrammingGuide/AudioSessionBasics/AudioSessionBasics.html
But standard iOS Clock app can use built-in speaker when 3.5 jack headphones connected.
What about bluetooth headphones? Can I send different audio streams to built-in speaker and bluetooth headphones at the same time using AVAudioSessionCategoryMultiRoute?