I actually did two takes (after you record a voice post it gives you the option to listen or rerecord it) because the balance was off in the original take, not that the balance was so awesomely great the second time around. I repositioned the cell phone so that there would be a little more guitar.

I briefly considered doing multiple tracks (requiring multiple phone posts and then some post-processing in Garage Band or something) but that seemed like cheating. Also, too much trouble.