I had the missing meta data problem as well... I let emplode fix it, and most are now fine.

However, a few of them showed something like "unable to extract frame data".
Now I have a number of tracks without a samplerate, and a few with really wacked out durations (some ~6 minute tracks showing as 50mins long!)

Can I force emplode to check them again (Is there any point, will it return the same value anyway?)

Jazz
(List 112, Mk2 12 gig #40. Mk1 4 gig #30. Mk3 1.6 16v)