I have a video file whose audio is accordian music at a dance performance that has lots of background chatter. What is the best way to eliminate or dampen this chatter? Everything I've tried so far reduces the general buzz in the background but leaves intact the audience's talking.

I uploaded this file to Dropbox https://www.dropbox.com/s/x66hd36qp8ilo2s/Reingelreihn%20Bacau%20a.mp4?dl=0 in case anyone wants to look at it.

I have been using PowerDiretor for a couple of years. It's a great program and the community forums are about the best I've seen for anything!