Hello,
VERY PROMISHING, just what I need.
Listening to music is not just a hobby for me, but lifestyle, food. My primary source was LP long time ago, when I started, very early, I was like 15 when I made my first Quad 405 (well, rather I blow up my first Quad 405 
. Now I’m 39 (brrrrr. 
After a long period with CD, my primary source is again LP, but Flac is very close also. At the moment I listen to flac through a TC Electronic Konnet 8, and an AD1865 NOS DAC is under construction, with a Lundahl trafo to the ECC82 output stage. The rest of the chain is tube based also, 6072 riaa and preamp, 2A3 PSE amp. Than a clone of an Audio Note E box.
I can describe easier what music I do not like, this is cheap bum bum tuc tuc pop music and cheap folk. I digest nearly everything else. Classical, Jazz, decent pop. I have a big collection of flac, I bought a lot from hdtracs also.
At the moment I use the PC and media monkey for flac >konnekt 8 > NOS DAC preamp. I would love to leave the PC off when I listen to music.
I can not say that I use Volumio yet, because it does not work yet on my raspberry with the 2T flac library on an smb share.
I hope I will be able to set it up, maybe on UDOO, use the I2S output to the 1865 directly and browse the library on a tablet.
THANKS A LOT for the project, I really appreciate your work.
Best regards,
Gabor Jordan