If you experience the wrong accents for some factions in KGCM you might want to try this sound fix. Look for the following files below in your main game SEGA\Medieval II Total War\data folder. Then copy all of these text files into the kingdoms grand campaign mod data folder. Open the descr_sounds_accents.txt and add all of the new Kingdoms factions to the corresponding accents. Then in the KGCM sounds folder delete the events.DAT and events.IDX. Now run game and test unit sounds.
descr_sounds_accents
descr_sounds_units_confirm
export_descr_sounds_prebattle
export_descr_sounds_soldier_voice
export_descr_sounds_stratmap_voice
export_descr_sounds_units_battle_events
export_descr_sounds_units_voice
Dave