Some info for anyone interested.
Audio Codecs: What They Are and Why They Matter
https://www.tomsguide.com/us/what-are-audio-codecs,review-4469.html
The ultimate surround sound guide: Different formats explained
https://www.digitaltrends.com/home-theater/ultimate-surround-sound-guide-different-formats-explained/
High-resolution audio
https://en.wikipedia.org/wiki/High-resolution_audio
High-resolution audio: everything you need to know
https://www.whathifi.com/advice/high-resolution-audio-everything-you-need-to-know
High Res audio download sites
https://www.prostudiomasters.com/?_ga=2.103346496.1911860630.1545374570-2087162848.1545374555
https://www.nativedsd.com/?_ga=2.104076480.1911860630.1545374570-2087162848.1545374555
http://store.acousticsounds.com/c/372/DSD_Download
http://store.acousticsounds.com/index.cfm?store=SuperHiRez
http://www.hdtracks.com/
https://www.sony.com.au/electronics/hi-res-audio-music-services
https://www.onkyomusic.com/US/home?select-country=true