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I seem to remember that there is an issue with overwriting FIDs directly in that the empeg stores an offset into the MP3 file as to where the audio data starts. If you change the ID3v2 tag's size, then this information becomes incorrect, potentially affecting playback.

Right. Which is why, in the thread that TonyC linked earlier, I suggested that the corresponding *1 file would need to be have the offset recalculated, and the database rebuilt, if we were replacing the files in situ. Fortunately, the technical details of how to do this are fairly straightforward.
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Tony Fabris