reply from Aurender support:
VU meter is mainly cosmetic.
We do have a plan to make it smooth, but we don’t have exact schedule.
Aurender N100h owners
I just picked one up a week ago and it sounds great but I think the VU Meter display kinda sucks. The “needle” jerks around in a very unnatural way, not fluid like with real ones. I know it’s really just for looks but I was kinda looking forward to the McIntosh look. I’ve got an email into their support, firmware is up to date. Anyone else having this problem?