I will check it and fix in next modpack. Weird, because I was specificaly testing it a lot, yet it ended up potentialy bugged.
edit: found small bug, well like I said, in next modpack.
Attach logs too, I remember few people reported me same problem, and I couldn't find a reason, probably some weird bug in one of the mods.... ¯\_(ツ)_/¯
You can install more crew voice mods at same time, then select them in the game sound menu. You can also add mod you mentioned that german female voices, just make sure you are placing that mod in own folder in res_mods\0.6.13.1\banks\mods\..... Not sure how this mod is packed (with what path) but in example the place for this mod would be like this: res_mods\0.6.13.1\banks\mods\GermanFemale\ and res_mods\0.6.13.1\banks\mods\GermanFemale\mods.xml.
This is how it was made, not all ships are covered. Authors of those skins are not making skins for quite long time, it's yet another case like before. Guess I would have to find new skins.
This mod wasn't updated for very long time and it may work like this. Until the author makes new update.
You posted in tanks, so I have to move it to proper section.
Your logs are incomplete, probably because installation was not finished. It's some local problem. So look in your pc, antivir or similar software this is where I would start.