Poweramp starts/resumes on its own

Poweramp can start to play when headset is inserted - you can disable this feature via Settings => Headset / Bluetooth => Resume On Wired Headset.

Also some applications for some reason can broadcast Headset insertion event sometimes - disabling Resume On Wired Headset option will help in this case as well. 

For BT connection, there is a separate, Resume on Bluetooth option, which is disabled by defailt.

Please note, that if both options are disabled and Poweramp still resumes on connection, this means device ROM (or most probably - some other app), sends MEDIA_PLAY command, which is the same as headset PLAY button press. This is controlled by Respond To Buttons option.

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