invisible mp3 playing.. how to detect what playing it and how to stop it.

I tried out KTimer package; using "new audio alarm" feature.
The "sound file" that i simply chosen was a loud noisy long mp3 , unfortunately..

It keeps playing the mp3 ... i can't do anything, there is no button to stop it..
I know By the time someone replied me, this mp3 should have stopped..

But how to detect which thing playing the mp3 and how to stop invisible mp3 player from playing ?

Thanks