I know there are apps that will change your voice when recording. Is there one that changes it while speaking on the phone? Or maybe one that inserts background noises? I loooong time ago my buds and I would hang out at a pizza place and eat pizza and drink beer. There was a phone booth there (remember those?) that for a quarter would play various background noises (airport, police sirens, construction work, etc.) while you talked on the phone. What a resource! I would love to have an app that would do either of the above!