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Can an Android phone be used as a Bluetooth headset/speakers?
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iPhone's Bluetooth - What? Why? How?
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iPad still plays the music when muted - how can I truly turn off sounds?
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Automatically change system volume when audio device plugged in?
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AVAudioPlayer, using AmbientSound session, is not playing when app is in background
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Playing mp3 with delphi
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How can I play mp3 files or videos?
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Play system sounds from one computer through another computer's speakers?
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How do I capture the audio that is being played?
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Prevent EarPod play/pause button from activating Siri on macOS Sierra
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how do I make my computer only play through my speaker even if headphones are plugged in?
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How can I play a custom sound when my battery is low?
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Add Music to iOS programmatically
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iOS 7: MPMusicPlayerController volume deprecated. How to change device volume now?
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OpenAL tone generation on iPhone