I have just finished a song, there are effects on there like Echo, Reverb, Compression etc, all Magix's own effects nothing imported. When I play it back I get a random noise (sounds like a Tibeten Bowl howling) in random places over the mix, it even moves around as it's not in the same place when I play the song again, the volume isn't on too high as the meter doesn't get into the red. I only have the headphones plugged in, does anyone know what is causing it and how i can stop it please? Any help will be very much appreciated, thank you.