Extract the lot, delete the sounds you don't like and delete the .bar file. I think the game will load in the loose files as if it is in the bar file. If not create a new bar file with the remaining sounds. A second alternative that is simpler that might work is what if you create a loose sound file with the same name as the one in the bar file but it is silent? (I don't know which would take precedent - hopefully the loose file)
[This message has been edited by nottud (edited 10-24-2018 @ 07:45 AM).]