I searched around and found about 5 package for Windows. The one I found that was about the best was a package called ST-X. Trouble is, I can't find the URL for the download site any more. I do have the install package still. I have had pretty good sucess using it in the car to flatten out the spectrum on a playback of an uncompressed (WAV) uncorrelated Pink noise track, but this was with an uncalibrated mike; you have to accept that this is only really a starting point.

I did start to look at how the loudness on the empeg worked using this, but didn't really have much time to take it very far.