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@Aaron > Congrats on the new XDJs!
The analysis mode should be set to Dynamic only for music with a varying tempo, eg. a live drummer. Use Normal mode for anything with a consistent tempo, typically most modern pop and electronic music, which has a perfect beat throughout the song.
Yes, it's a good idea to manually scan through your songs to see how the beatgrid has been applied - it's usually pretty accurate, but it's worth verifying.