A musician friend, who is producing his own album, asked for advice about how best to master the FLAC edition of the album. It will be distributed as a physical CD, as MP3 files, and as FLAC files. Customers will choose whichever format they prefer. The FLAC format edition can be tweaked to do something better than the other formats.
My friend is not a FLAC format expert. He starts from the studio masters, which were professionally done. What instructions should he give the software producing the FLAC files? Should the audio in the FLAC be 24 bit/96kHz, or 16 bit/44.1 kHz? What metadata should he include? What does FLAC do better than CD or MP3 formats? Any other best practices he should follow?