I've searched the App Store and didn't find anything, and it's entirely possible it's actually there and I just overlooked it, but... Is there any kind of vocal trainer app, where you can use the mic to train tonal control? I'd like to learn how to sing better but can't trust my own ears and don't want to torture my wife; I was wondering 1) if there's some sort of app that can teach you to sing on key and/or 2) this is even feasible using the iPhone's microphone... Something along the lines of Karajan, but instead of playing the note and having you match it to a list, it'd play (or even display the symbol for) a note and have you match it by humming or singing into the mic. .
