Does it still work for you? I cannot use the volume controls and tried every driver version (from 1.0.5 until the news 1.5.0)
Line 6 support suggested to use the version 1.1.0 because i still have an intel mac.
But it does not work for my late 2013 macbook pro with intel processor on Big Sur. I only get the HX Stomp default audio core device without volume control.
It did work a few years ago before bigsur.
Update! It works!
Ah now it does work for me again including volume control.
I did the same as before but waited longer after installs and restarts and did a restart after the driver install first and only after the restart clicked allow in the security settings. I did the following:
disconnect hx stomp
delete old kext: sudo rm -rf /Library/Extensions/L6Helix.kext
restart
install driver version 1.1.0
wait a few seconds until security notification about allowing the driver appears
Do just click okay on the notifaction and do not go to the settings yet
restart computer
after restart wait a moment (perhaps not needed)
open security settings and click allow on the line 6 driver info text
do not click restart on the appearing notification
but wait a little moment and click restart on the button which said "allow" the driver before
after restart i waited a little moment and did a restart again (i guess just for fun, don't know if really needed)
the after the computer started again i waited a little moment and connected the already started hx stomp via USB
Now it is shown again as "Line 6 HX Stomp" instead of only "HX Stomp" and i can control the volume.
I'm happy again ;)