Recording an App's Stereo Audio Output?

Hi, does anyone know if there is an app, or a way, to record the stereo audio output of an app internally within the ipad, that I could save and then use with the stereo file within other programs?

For example, is there a way to record the output of a synthesizer app, so that you can then import it into studiotrack or something, all without the signal/file leaving the ipad? (I know I could record the physical stereo output into a macbook or something and then import it back in, but it'd be cool to be able to do this all without eaving the ipad?)

I hope that makes sense!

Thanks