Will you let us know when you find out about this, Jar Jar?
Yes, like I said in my previous comment you can remove 2 of the channels to completely eliminate the old speech. Unfortunately, it also takes out most of the children laughing.
EDIT: All of the speech is mostly condensed into one channel from what I’m seeing. I think this would be a game of enabling and muting the one track whenever the children are seen laughing. There is still some subtle laughter in the background without that main channel.