A free iPhone app shows teens what its like to experience hearing loss from cracking up the music. Auto-Old My Music plays music the way their parents may hear it - muffled from the loss of high pitches. The app was developed by Baptist Memorial Health Care in Memphis and you can find it at playitdown.org where it has been downloaded more than 10,000 times. If kids want to check their hearing, there's The Volume Zone and The Ear Knob,
