sorry my bad english. i used mumble 6 month ago and then i used this dll file - u need to put this in wot root catalog. C:\Games\World_of_Tanks\
then u need to activate in mumble overlay settings and configure where u want to shot this overlay (i had right"corner" in the top)
this picture shows that its working - im using push to talk settings ;)
i just tested and when i start tank, i get some errors but it working.. i remember that this dll file conflict with wg stream mod - if u using it then u cant use it.
I forgot to tell that mumble need starts before wot !!! or its not working