You can change the volume for the voices as well as the music in the options menu I believe.
Could someone verify this for me. I don't have the game installed yet due to some pc problems.
I may be doing this wrong, but "Host" sound effects all main sounds, I tried muting the host sound, and all I got was muted NPC's.
I tried many things, but the same reaction everytime.
I think you just have to deal with it...