This is a testing release; it might not work, and it might break your system. I can say that it at least boots and the Fedora RPM sees my Gen 3 4i4 and Gen 2 18i20. I don't have a Gen 3 8i6, 18i8, or 18i20 to test with. If you're willing to try it, please get in contact and provide feedback!

This release adds support for Gen 3 8i6, 18i8, and 18i20, including 18i8 and 18i20 Main/Alt speaker switching.

These things should still work for the Gen 3 4i4 and hopefully others too:

• same mixing/routing, line/inst, pad options as for Gen 2 devices
• enable/disable "Air" to make your guitars and vocals sound instantly brighter and more spacious
• enable/disable Mass Storage Device (MSD) mode

As for the Gen 2 driver, you need to enable the driver at module load time with the device_setup=1 option to insmod/modprobe. In /etc/modprobe.d/scarlett.conf, something like one of these lines should do it:

4i4: options snd_usb_audio vid=0x1235 pid=0x8212 device_setup=1
8i6: options snd_usb_audio vid=0x1235 pid=0x8213 device_setup=1
18i8: options snd_usb_audio vid=0x1235 pid=0x8214 device_setup=1
18i20: options snd_usb_audio vid=0x1235 pid=0x8215 device_setup=1

Enabling MSD mode seems to me to be something that you would never want to do, so once you disable it the control gets hidden (use device_setup=3 if you really want to make it reappear).