It doesn't have to be mast volume, just a master bus or something. To be honest though this isn't really a solution, the real solution is to be able to apply effects to multiple tags. "tag1" & "tag2" etc That way we can make mixers. At the moment, if I want reverb in an area I have to have all the sounds under the same tag. So, what if I wanted to control one of those sounds? I can't because if I pull it outside of the reverb tag, it won't be affected by DSP.