The bass, treble and voice boost act on the parametric EQ on certain frequencies. When you use it is like you add a band and boost/de-boost them. Currently their effect is not visible on the PEQ but it will be visible in then next versions - this should help you get a better sense of how your EQ looks like when you use those effects.
About the Virtual Surround: from GG 16 we added a slider to tune the virtual surround. Previously the surround was tuned more on immersion which can sound a bit "muddy" for certain games or content. So with this control you should be able to get a good surround experience based on your taste and content

