This picture,
https://picasaweb.google.com/lh/phot...full-exif=true, shows what Sound Forge sees of three different Everly Brothers duplicate tracks, from two different multiple artist compilation and one E.B. compilation. They are clearly different, and sound slightly different, but were all ripped by dB 14.2 at the same VBR extreme using the Lame 3.98r encoder. The Foobar add-in bitcompare shows no difference at all between any two of those three files other than a "length mismatch." Strangely enough, comparing two different Nat King Cole "Nature Boy" tracks, one a mono American recording, converted at CBR using FHG encoder, the other a stereo Italian recording converted at VBR using Lame 3.98r, shows only a length mismatch, so I do not believe that bitcompare gives any useful information at all. I am appreciative of the suggestion to look at the foobar components, since I just recently started using foobar, and I see that it may be useful in ways that I never expected.