Filed under: Portable AudioApple's already given self-controlling individuals the option to limit their iPod's maximum volume level, but if a newly surfaced patent application is any indication of the future, your next PMP from the Cupertino powerhouse could actually tone things down for you. Reportedly, the app explains that software could eventually keep track of how long -- and at what volume level -- you've been listening, and if it determines that you could be damaging your ears, the volume could be automatically adjusted down for your own safety. Granted, there's no way to definitively
