Default [Q] Volume Problem (Kinda)

OK I've had my Nexus 7 for about a month now and have only started to use it for media. It really isn't an issue, but I would love it if someone found a solution.

Whenever I try and control the volume via BT headset, plug in headphone or the controls on the car. It pauses whatever is on the screen. The only two apps that I use is Google Play Music and MX Player. Outside of these two apps I have not tested it on anything else.

If someone can help me with this problem, I would greatly appreciate it.

Thanks in advance!

4.4.2 Stock Unrooted
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