For those of us who like to listen with our eyes as well as with our ears, one thing that MCompare could have is comparative views in the timegraph, showing the Output (as shown at preset) AND whatever was (most-recently) selected for the comparison (i.e. File 1...n or Source 1...n).
>>> http://i.imgur.com/mlEdL6L.pngWe would be able to show lines for the Output (level, crest, waveform etc) and for the comparison. The Graph Settings window would let us pick any of them:
>>> http://i.imgur.com/n0JeUU4.png