I have only had my Hero for a couple of weeks and am generally happy with it, but this issue is really, really bothering me. I dont know if it is an android OS issue (there are no settings I can find to overcome this problem, and My old HTC Touch HD also made by HTC did not have this problem) When listening to music via the headphones, the phone MUST automatically reduce the volume of the incoming call and notification ring sounds. It is dangerous for healthy hearing! Seriously, my phone is almost always set to full volume throughout the day, but when I plug my headphones in, and am listening to music, when the phone rings the ringing is UNBELIEVABLY loud and has frightened me out of my wits a number of times. My Touch HD used to automatically reduce the ringing and notification sounds when headphones were plugged in. Perhaps Android OS is not capable of this? I am curious to know, and would buy an app which could overcome this problem. Thanks, Mark.