The game starts at zero volume for me. I learned from a user on our Discord that we need to press 5 a few times to raise it to an acceptable level before we can hear the menu. Feel free to update your build with a different default volume level.
Hmm, that seems to be the case for some people. Normally the volume should start at default 1 and then the volume you set it too. I am sorry, that it´s not clear!
