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When i plug in a speaker and play bird calls from an app the music app cuts in and plays over the bird calls. How do i turn the music app off so when i press the play button on the speaker it plays the bird call app only?

I’ve encountered this issue with all the iPhones I’ve had. It’s an iOS issue, I think it can’t stream 2 audio streams at a time. Swipe to open control center and play the music. Then turn off the sound in the game using game options.