Mark,
Recently, I was looking for a large display LUFS/RMS meter and found the YouLean meter. I am using it with Reaper, so cannot tell you if it will work in Sonar.
It is meeting my needs, and appears to be as accurate as the Schwa plug-in, in Reaper. I really like the large display better than reading the Schwa.
Dale
Dale, Thanks for the response. I've got youlean installed . Seems to be working fine. Now to figure out all the controls .. I'm comparing levels on a new 13 song cd , this should make it a lot easier. Thanks.. MS