Change stock Clock app timer noise? In the stock clock app (4.2 stock Android), there's a timer function; the one where e.g. you type in 8 minutes and an alarm goes off in eight minutes. However, the noise it makes is absolutely unbearable. It's like a smoke alarm. There doesn't seem to be an option to select a different sound. I'd rather not use a different clock app; I like the stock one. I just want to change the horrible noise. Any tips?
I've got the same problem and the annoying sound can not be found in /System/media/audio/, but in /system/app/DeskClock.apk/assets/sounds/Timer_Expire.ogg. In any case, it seems difficult or impossible to change.

There is more info here: 
http://androidforums.com/nexus-4/668411-super-harsh-countdown-timer-sound-nexus-4-how-change.html