I have just re-arranged my UAW160 multiplayer folder, and made a couple of extra "dir.set" files.
The result is as follows:
The Finnish theatre gives Russian voices in allied planes, and Finnish voices in Axis planes (independent of plane-set).
The Spanish theatre gives Spanish voices with both.
I have a South Pacific Multiplayer, and a floatplanes theatre, which give Japanese voices for Axis planes.
I do not have the SPAW2019 folder in this one, because it is a beta. In any case as it is a beta there are no speech files in it in order to minimise the download.
They will be added with the release version.
I notice also that Carrier Air War has Japanese voices for Axis planes.
For the people using my multiplayer version I will create a patch for the Finnish Theatre
The post is here
Multiplayer thread Jel