Control Running application

I was running Rocket Music Player and the phone be connected to speakers.
But as I can see, I was not able to control that running app remotely through this app, as in changing the song or seeing the list of songs or increase/decrease volume or change the equalizer etc.

This could be stated w.r.t other apps as well..like the most popular watsapp..

Add this feature to your app and take my word..it will be even more popular...

anyways great app !!