There was a thread on this a few years ago, you might want to check the archives, it was pretty interesting. If you really want to go nuts, Lloyd Walker insists (and puts it in the instructions for his motor drive, so I'd imagine it's in the instructions for other electrical equipment he sells) that changing the direction of the fuse in the fuse holder changes the sound, and that it will sound better one way over the other. I myself heard no difference, probably because my wife's laughter over what I was doing drowned out the music.
