Filed under: Multimedia, Software, Odds and ends, iPhone, App StoreDo you need to make basic sound level measurements? For example, do you want to prove that your next door neighbor really is playing music loud enough to make your ears bleed? Faber Acoustical is coming to your rescue with their US$19.99 SoundMeter for iPhone. They discovered that both the built-in and headset microphones of the iPhone have a flat enough frequency response to make them useful for measuring sound levels. To qu