Accuraterip checksum?
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solbu
Accuraterip is an accuracy checker for CDs ripped such as in Exact Audio Copy (EAC = Win32 Grip like app). I don't know if the Accuraterip technology is open and free enough for GRIP, but the checksum and popularity comparison of the checksum in a CDDB sytle online database to determine rip accuracy seem very clever. Perhaps its worth adding Accuraterip to GRIP.
ps. Accuraterip is not a substitute for FreeDB, but an augmentation.