Why is the volume gradient of the POCO X7 Pro speaker not smooth?

Thank you for your support of Xiaomi products. All mobile phones undergo strict professional inspection before leaving the factory, so you can use them with confidence. We apologize for the inconvenience caused to you. If you notice that the volume gradient on the POCO X7 Pro speaker isn't smooth or the volume is too low, please go to [Settings] >> [Sound & vibration] and slide the volume bar to adjust the volume you want. And you can also go to [Settings] >> [Sound & vibration] >> [Sound effects] and manually set sound effects as you prefer. Thank you for your continued support and understanding.