First, hats off to the programmers. I've been looking for a program like this for years and was constantly surprised that no one had used FFTs and signal processing techniques to provide a quality metric of a music file instead of just using the bit rate. However, I do question that a 128 kbs file and even a 160 kbs file (not vbr) can be evaluated as 100% for a quality metric. I can certainly hear a degradation in quality at 128 kbs and sometimes 160 kbs compared to the original. It would seem that even if all the basic metrics such as clipping and spectral roll off are good, any 128 kbs file should be rated at less than 100%. Perhaps 99% maximum for 160 kbs encoding and 98% maximum for 128 kbs encoding would be appropriate if all the other metrics are good.
Thanks,
Mike