It was
[ 165.844740] snd_usb_podhd 1-1:1.1: Line 6 POD HD500 found
[ 165.844742] usb 1-1: selecting invalid altsetting 1
Now the altsetting is correct:
[ 183.317968] snd_usb_podhd 1-1:1.1: Line 6 POD HD500 found
[ 183.322074] snd_usb_podhd 1-1:1.1: Line 6 POD HD500 now attached
So it's a different issue if it still doesn't work.
It was
[ 165.844740] snd_usb_podhd 1-1:1.1: Line 6 POD HD500 found
[ 165.844742] usb 1-1: selecting invalid altsetting 1
Now the altsetting is correct:
[ 183.317968] snd_usb_podhd 1-1:1.1: Line 6 POD HD500 found
[ 183.322074] snd_usb_podhd 1-1:1.1: Line 6 POD HD500 now attached
So it's a different issue if it still doesn't work.