I got a Bluesound Vault a few years ago and ripped all my CD's onto it, but could not access the music by composer or symphony number. It only lists "song" and "artist" which only applies to pop music. I got some help transferring the files onto a flash-drive where in my laptop I made folders which list composers in alphabetical order and subfolders for symphonies and concerti. The Vault went bad and had to be replaced on warranty and I don't use its storage, I plug in the flash-drive. I keep several copies of my library on backup flash-drives. Trying to use the Vault's storage and transferring it to my library is unmanageably complicated so I won't attempt it. I can add purchased downloads to my flash-drives instead.
I connect the Vault to a vintage MSB Platinum DAC.