I did some videotaping on a recent vacation (with my Canon XH-A1). I have one segment where I was videotaping a group of people sitting on an outdoor stage several hundred feet away, with a crowd of people sitting (mostly) between the stage and me. The mic picked up the sound from the loudspeakers, but it also picked up a low murmur of chatter from some of the people around me. Is there any way to filter out the chatter using Vegas Pro 8?