YMMV:
This is what worked for me on Ubuntu 16.04.02 for the Pod X3 Live:
Installed KXStudio repos (for updated qjackctl to fix a bug I had)
# Install required dependencies if needed sudo apt-get install apt-transport-https software-properties-common wget # Download package file wget https://launchpad.net/~kxstudio-debian/+archive/kxstudio/+files/kxstudio-repos_9.4.6~kxstudio1_all.deb # Install it sudo dpkg -i kxstudio-repos_9.4.6~kxstudio1_all.deb
Then I installed the latest mainline kernel for amd64 from here: http://kernel.ubuntu.com/~kernel-ppa/mainline/
linux-headers-4.9.37-040937_4.9.37-040937.201707121132_all.deb linux-headers-4.9.37-040937-generic_4.9.37-040937.201707121132_amd64.deb linux-headers-4.9.37-040937-lowlatency_4.9.37-040937.201707121132_amd64.deb linux-image-4.9.37-040937-generic_4.9.37-040937.201707121132_amd64.deb linux-image-4.9.37-040937-lowlatency_4.9.37-040937.201707121132_amd64.deb
Then I rebooted
Upon reboot, I can now see my Line6 connected in ALSA:
hux@bot:~ $ aplay -l
**** List of PLAYBACK Hardware Devices ****
card 0: PCH [HDA Intel PCH], device 0: ALC269VC Analog [ALC269VC Analog]
Subdevices: 1/1
Subdevice #0: subdevice #0
card 0: PCH [HDA Intel PCH], device 3: HDMI 0 [HDMI 0]
Subdevices: 1/1
Subdevice #0: subdevice #0
card 0: PCH [HDA Intel PCH], device 7: HDMI 1 [HDMI 1]
Subdevices: 1/1
Subdevice #0: subdevice #0
card 1: PODX3LIVE [POD X3 LIVE], device 0: POD X3 LIVE [POD X3 LIVE]
Subdevices: 1/1
Subdevice #0: subdevice #0
So I start qjackctl
Under 'Setup' then 'Advanced (tab)' - I changed the input and output devices to point to the Line6 detected device.
Saved, then clicked 'Start' on the jackctl transport
Then I started Audacity and made sure the Jack Audio Connection was set, along with the input channel (in my case to '2')
See screenshots for reference points
Good luck!
