Help with Focusrite Scarlett 2i4

[gimmeapill]

For the GPG keys, see:
https://wiki.archlinux.org/index.php/Ma ... e_checking

Assuming you trust the key in question, It should be as simple as

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$ gpg --recv-keys xxxmissing_keyxxx

Otherwise, I suspect that the order of your devices is not consistent across reboots and/or applications, which is maybe what confuses jack utilities. This would also probably explain why you don't have the same behavior between debian and arch.
This can usually be solved once for all by writing your /etc/modprobe.d/alsa-base.conf (or whatever .conf file you have under /etc/modprobe.d/ that manages audio) and put your 2i4 before the others by setting snd-usb-audio index=0:
https://wiki.archlinux.org/index.php/Ad ... sound_card
http://alsa.opensrc.org/MultipleCards

The 2i4 doesn't necessarily have to have index 0 for jack, but that could maybe help for pulse audio (if you still have that junk activated).
If you have several USB devices, you can also set an order between USB connected devices by using the VID/PID:

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options snd-usb-audio index=1,2 vid=0x0ccd,0x0d8c pid=0x0028,0x000c

Product and vendor ID can be found with lsusb or at the bottom of the focusrite linux page:
https://focusritedevelopmentteam.wordpr ... -products/

If you need, I can post my example with a 2i2 in a few hours from now.

The point here is to have a consistent configuration system wide. If you've done that already, forget this post