Correct when piping through the HDMI all is well with sound levels. The only reason I wanted to use the AV jack is so I could play Pandora with the TV off.
I cannot even install Firefox. ???
I got the image from from https://www.raspberrypi.org/software/operating-systems/
"Raspberry Pi OS with desktop and recommended software
Release date: January 11th 2021
Kernel version: 5.4"