People have reported low sound for it and others in the past. Might do a google on that.Does anyone know why the game is so quiet? I usually used headphones and didn't notice, but I put the sound on the TV and it was very quiet. I had to turn it all the way ip to hear the music and the dialogue. Not sure if it's the same on the console version.
You might also go to your sound mixer settings or hit windows+g (either while playing ) and make sure the MK11 audio dial is all the way up. Applications now all have their own volume settings and Windows remembers them. If one gets set low for some reason, you might never know it.