Used to play on other apps

I really love this music app. Its great to take to school or on a trip. But lately it hasnt been playing in the background of most of the apps I go on. It can only play if I either stay in the music app, go to the home menu or If I turn my iPod off. It wont work while im texting my friends, or if Im on google, or if im on tumblr, etc... Please fix this

English x Angel about Unlimited Music - Advance Player and Manager, v2.0