The VSTplug governor is a basic solution for mastering to meet -6 dbfs standards. It's a new release and though there is no known issues, it should meet your expectations in regards to being able to mix down to a certain level.
Though it's not entirely accurate in the way of knobs, without adding lufs c-weighting and such it's hard to do. But it works. I hope that's good enough. I plan to attempt to add c-weighting for the dB level, My fear is that it will not be real time, and there will be 20, 30 ms latency.
Perhaps as an option it would be best.
Please keep in mind this a prototype that was made to test a theory. And I think that's important for a developer to do. I stick My head out once in a while to make something cutting edge and I'm glad that this product for the most part came out fairly well. I think there's a big room for change in this product but it is an interesting idea.
+ initial release.
+ fixed 64-bit gain, oversampling bug.
+ changed algorithm to set min & max more effectively.
+ updated GUI.
+ pumping mode (gentle, soft reduction)
+ LUFS detection option (using c-weight and double precision).