I have successfully installed MC21 on my Raspberry Pi2 and made the necessary modifications to allow headless operation and RDP access - thank you to all parties for providing the necessary guidance within this forum.
The installation has scanned my audio library which resides on a NAS and all appears to be well in terms of track and album counts. However, when the MC21 server is accessed from an audio player it is served with MP3 files (transcoded?) rather than the original FLAC files that reside on the NAS. I simply cannot find how to change things so that FLAC files are served up and would be grateful for any assistance. Thank you.