What is odd is that this functionality has changed. At one point in time making or receiving calls would not interrupt music but wouldn't allow you to separate phone calls from music as output to a Bluetooth speaker. You would need to manually touch the Bluetooth button during the call to disable the call sound going to the speaker and the music would continue alone. Now you can stop the call from going to the speaker in the first place but unfortunately now the music pauses till the phone call is finished. It's really a pretty crucial feature to develop.
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