At least half of the files with the wacky duration have been VBR "fixed" by MP3 Tag Studio, which is why I am slightly concerned...

I'll try the other tools linked when I'm next running windows...

Jazz
(List 112, Mk2 12 gig #40. Mk1 4 gig #30. Mk3 1.6 16v)
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Jazz (List 112, Mk2 42 gig #40. Mk1 4 gig #30. Mk3 1.6 16v)