From your description, and without seeing your project, I’m guessing that you are trying to apply the sound effector to a standard object rather than to a mograph object. If you’re trying to apply it to a cube, for example, make the cube a child of a Fracture object and apply the sound effector to the Fracture object. When set up properly, either wav or mp3 (plus several others) will work.

And you may need to move or adjust the size of the sound probe so that it is reading an active frequency range.
