plz help.

(vchat == voice chat)

I've been trying to dig up old forum posts and guides with no (understanding) avail. I have a demo of a game where half the server did karaoke and I wanna try syncing them up with an external audio program. I have the option to record it directly from the game by Audacity or something like that, but trying to mute most of them with only one remaining doesn't seem to be a option when I tried searching it up.

I'd really like to know if it's possible to just straight up download the voices for ease of use. If not, how could I mute one person at a time on a demo? Thanks.