I also had a couple battles where, if I dared to zoom in at location dense with female models, I would hear a lot of screeching sound... Its actually very realistically done, as most women have high pitched voice, but it almost completely drowned the male voice so that even in a 50% men 50% women unit I mostly heard the women. This coupled with historical problem of said presence of female, it can be doubly annoying.
This didnt happen all the time I was playing with mixed units, the sound can be a bit random.
A strange occurence in my frankish campaign was with that unit:
Which is strangely made of nearly 90% of female, god knows why (bagaudae were brigands, not feminists...).
Because they are extremely cheap fodder I use them massively in battles and it can end up looking like that in battle (screeching sound not included).
Bonus funny: only men can wear caps/helmets it seems, women are always with their hair combed and all
I think women's voice need be somewhat "nerfed" and the mixed units balanced to have never more than 50% female models, except if we're talking about amazon units.