"... you dislike the "voice set" you selected at the beginning, and now simply want to use one of the game's pre-formed voice sets?"
Exactly. I should perhaps been more precise in my first post.But it's not the annoying elf male. It's a dwarf with the deep goblin voice which is just so wrong. I just selected the portrait without paying attention to the voice but I was sure that each portrait had a default voice set that you would not have to pick independently.
I'll rename the sound files as described. mm8editor (mentioned in Pascal's post) doesn't crash while playing the sounds files).
Thank you all.