Again I repeat once more MY belt is warped, let me repeat my belt is warped. I visually confirmed this and I say again my belt is warped. This is why my belt is making the noise and yours and others are not. No one in my local group is hearing this noise because their belts are not warped.
because my belt is warped, Polaris has decided to send a replacement belt, I repeat because my belt is warped, polaris is sending me a replacement belt because my belt is warped.
This is why after 17000 miles you have not seen this issue because your belt is not warped.
I have looked at my belt during cleaning and as far as I can see there are no signs of any damage.
Here is another slingshot with a very similar sound.
Sounds like you might have a warped belt.... but I can’t swear to that...