Disable auto-app switch on Xperia Z3 when headphones are plugged in I know this is supposed to be a feature but it's just plain annoying at this point. Anytime I plug in my headphones, it will automatically open up whatever my primary music player is (PowerAmp right now) and start playing the first audio file it finds.

I seem to remember there was an option in the phone's settings to change this but I can't find it. Checked "Xperia Connectivity" and "Sounds and Notifications".

Suggestions?
It's the Smart Connect app. You can simply toggle it off under the Events tab.
Smart Connect starts up any app or action that you have associated with specific accessory such as Headphones.