Looking for e-drummer with iPad experience

It is all about connecting an iPad in a way that I can hear 2 audio inputs i.e. my practicing the E-drum and the song on YouTube that I am trying to follow.

It works with Garage Band and the E-Drum set but that is not what I need. I use http://songsterr.com/. Once I start this, the E-Drum is off and back on again when I use Garage Band. (The devices are connected with a small hub which includes a USB-A for the E-Drums and an audio plug)