How do I do this in Traktor Pro so that the track slows down and speeds up gradually?

DJ_Vladyzes

Please help. How do I do this in Traktor Pro so that the track slows down and speeds up gradually? i used this function flexible beatgrids ,bpm started to decrease and speed up, but no changes can be heard on the track,I want the track to play slowly at first, and then even faster, even faster, even faster, again slowly and speed up again. it works for him on video, I try it like this, it doesn't work like that for me.

https://youtu.be/l2Rn6dMG0dI

Unknown

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