Sound slider

Hey all. With the sound slider tutorial i dont understand wheats happening. When i run it a message is comming up saying “error loading”. The thing I dont get is where exactly is the program loading “sound2.mp3” from? Do I have to load it into the timeline?
Can someone please explain it for me? Thanks 8]

sound2.mp3 is loaded dynamically from the same folder where the swf is located.

note. you don’t necessarily have to load it from the same folder. if you want to load it from a different folder, make sure to change the path to the mp3 in the code.