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Hi!
I've configured Smart Connect to turns on and play Spotify when I plugs headphones into my Xperia Z2. But then starts not only Spotify but Walkman too. I've checked all Smart Sonnect settings and there is nothing about Walkman. Where are settings where I can turn that "feature" off? Thanks in advance! 
I have Xperia Z2 with 4.4.2 / 17.1.2.A.0.314
Clear data for smart connect and add spotify again.
Nope.
I've just cleared Smart Connect settings in Settings/Apps and set Spotify from scratch to start automatically. And again Walkman and Spotify starts together. 
Ok, thanks.