f I have a duplicate track (exactly the same name and artist) it would be great if 'something' other than me could determine this and just put a playlist link instead of another

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Most of my music collection is also techno/trance.. one problem I think you might run into is that there's frequently different mixes for different songs - it won't be seemless to have two nearly-identical songs in two different cd's if you just use one of the songs..
-mark

...proud to have one of the first Mark I units