Hello,
I have a Focusrite Scarlett 2i2 connected to a RPi 3 (Model B). Connected to the 2i2 is a set of speakers and a sub (all independently powered). After trying and failing to get this setup working in Raspbian Stretch, I decided to try Volumio. Unfortunately, with the same result. I have of course selected the 2i2 as the output device.
In Raspbian as well, everything looked good except for the fact that the only available setting in ALSA was “Internal validity”. This seems to be the case with Volumio as well. I might add that my 2i2 is almost certainly first gen.
Please advise!