I recently came upon a way for getting my electro/dance mixes really loud. Electro usually has more bass energy than metal, so this will probably work very well for rock/metal too. My mixbus chain for this is: 1) Sonalksis Free-G Stereo 2) Satson Buss (signal peaking at 0db VU) 3) Voxengo TapeBuss (set to "Tape Compression" at 1 or 2 db GR) 4) Duende Stereo Compressor (4:1, 30ms attack, auto release - at 1-4db GR) 5) Fabfilter Pro-Q (set to "Subtle Stereo Widening" preset) 6) Fabfilter Pro-L (set to "bM clipping" preset) The trick is now to use the Pro-L as if you were clipping A/D converters by driving the signal up with the output of the Duende and watching the RMS meter of the Pro-L. It's been very easy to get up to -8db RMS without any artifacts or kicks/snares disappearing and -6db RMS is usually no problem either, but I don't really need it to be that loud. I usually mix without any limiting, so this is all done after the mix is finished. If you have Pro-L, try it!