Idealy if your track tempo isnt constant and only swings a small hardly noticable ammount you can put the song though Abletons beatwarping system before saving it and loading it up in Traktor again. This time around it will have a constant tempo and will be way more mixable.
The drawbacks of using multiple beatmarks is that it will eat up all your precious precious precious cue points
Also you can get a much tighter grid in Ableton as you will be able to place as many beat marks as you need. Just export the file when your done in Ableton and your good to go in Traktor
Also id love to know what kind of music you are having problems beatgriding.
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