what is this sound.new bike ridden 15 times..2024 year

What sound are you concerned about? The air phishing or the cobble sound?

The air is normal, you likely just need to reset your positive/negative chambers. It also seems like your rebound is very fast, which makes that noise worse.

The other noise requires way more information action that you’ve provided to decipher the cause.

Also I’m just gonna be a dick and say 15 times is far from new. If you ride ~2.5 hours a ride you’re already at 37+ hours. Air can service should be done at 50 hours.