How to mod sound in KCD?

Hello, I want to replace some sounds in KCD with different ones. I searched for any tutorials but only found this one https://wiki.nexusmods.com/index.php/Sound_modding_in_KCD, but I haven’t really found out how to do it.
So far I’ve managed to make a zip file from sounds.pak and I got all the .bank files, but that can not be opened in Fmod.
Thanks for any help.