I mean that the 2.0.1 is your Sabayon version.
However often a low volume on some of the mixer parameters leads to a low sound volume.
For example I got a low volume on my laptop because I have a master volume which controls the overall audio volume,
but a PCM and Front volume also that influences it.
So I keep PCM and Front to the maximum, in order to have always the highest volume possible.
Try to play with the mixer, you will find out interesting results