I think as well a you that the output of the Audya is to low when I listen with headphones. Most of the time I need to have the Master Volume all the way up.

If you go MENU--->KEYBOARD CONTROL---->PITCH VOLUME-TRAN----> and select SOUND CARD LEVEL and increase to say 60 the output get increase. The same can be done to RIGHT BOOTS LEVEL (increase the volume on the right sound).

The only problem is that I don't know how to save this configuration as default. When the Audya is turn off, it is back to the original volumes levels.