The recording affects some other halium 10 devices too.
See this issue for a temporary fix https://github.com/ubports/ubuntu-touch/issues/2022
About the low audio, never had it myself, make sure you don't have the camera app in the background when playing audio, or don't play from multiple sources at once.
A quick fix is also restarting pulseaudio with pulseaudio -k instead of rebooting