system vibrate issue

Hello,

All of the methods below do the exact same hard vibration on my phone (iphone15)

system.vibrate(“impact”, “light”)
system.vibrate(“impact”, “medium”)
system.vibrate(“impact”, “heavy”)
system.vibrate(“notification”, “warning”)
system.vibrate(“notification”, “success”)
system.vibrate(“notification”, “error”)
system.vibrate(“selection”)

I’d like to have a very gentle and subtle vibration, but I cannot figure this out.

Thank you.

I am not sure if this related to my phone, or the system.vibrate() has some issues.

Thank you.