If BubbleUPnP works it is a fine free program. It is for control only, all music goes directly through the streamer from the Web.
Aurrender all functions? Wrong, no Roon.
I figured they built it for Roon because Paul was such a fan years ago. And he does not build anything for local USB play. Magna Mano Ultra gives you i2s AND 4 USB ports, Roon if you want it.. Built in PS (no wart.)
They will flash it to any OS you want. And it’s less money. If you can hear a galvanic isolation difference, keep it.
I put Octave radio in Volumio easily.
Linn radio is no longer in the Tune In directory.