This isn't a mod but an assortment of various mods and fixes for cutsom Skins ad Voices, this contain the advanced model support mod various fixes for the bonus packs and mutators for voices that allows to use male and female voices regardless.
This little mod allow to use multiple faces with the boss skins who uses the Xan Kriegor model
"Description: This allows skinners to make multiple faces for the boss. At time of writing however, no skin has taken advantage of this. The only thing special it does right now is allow skins that don't have the skinname5xan and instead 5facename in the UTX to still show the talktexture (so now the brass talktexture will show!)" -bossface.txt (readme)