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Old 23rd December 2010 | Show parent
  #5
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According to B.K., only a few frames of difference in spacing between tracks will make the CDs unique to gracenote. Content will have no effect, as gracenote doesn't look at that.

If the vocal and instrumental tracks are the same length, and the spacing between the tracks is the same, and the track count is the same, the discs are the same to gracenote. Not sure why an instrumental mix would be different in length from a vocal mix, unless you changed the head or tail.

Try inserting a different spacing between two of the songs on one disc, and see if it makes a difference to gracenote. I haven't tried this but BK says it will work.