OK for those that don't know here's how to play iTunes music during fast. Step one: have your home button settings iPod/iPhone so that iPod controls pop up when music is playing upon a double tap. Step two: open iPod & start a track (I picked danger zone or mighty wings) Step three: launch FAST, when the "sgn cube" pops up double tap home bring up your controls & pause track (leaving iPod window up & letting the fast intro play beneath) after the intro vid is done press play & close the iPod window. Step four: enjoy, at any time you can double tap home bring up the pop up and switch tracks. I usually pause before but if you do it while playing it will pause for you. Note: if you at some point your missing engine sounds just go to the fast options and turn sound off then on. Only happens occasionally.