oh man.. i had to open WMM to remember this.
ok first switch to timeline view by clicking the top icon at the lower left corner.
next click on the lowest icon on the lower left and drag the bar all the way to the right. close the audio levels window. then click the play button then stop then play again and it should do the music w/o the background noise you will have to redo this everytime you edit something / add a clip to the timeline
An ocean of dust and randomly strung together pieces of hydrogen, serving no purpose other than allowing all of us to continue in our misery, doomed to an enternity of petty squabbles and meaningless ego trips, until the whole thing one day explodes and starts the whole shebang all over again. - Chaos_Angel