I’ve many green edged CDs, but I must admit that I view CD players and transports as unnecessary when you can do bit perfect rips that are played by a high quality server/streamer.
"Tuning" CD's
Shaving Compact Discs to improve the sound (?!)
This Youtube will trigger the usual chorus of self-appointed audio rationalists, but I have a much simpler workaround that involves simply sanding the edge of the CD and then blackening the edge of the CD with a magic marker - all in the service of nullifying incident laser reflections bouncing off the glossy edges of CD's.
The results were so impressive that I now perform this procedure on all of my CD's. I should add that my system plays CD's only which are burned from downloaded flac files. The files are converted to .wav files in JRiver and burned at the slowest speed my desktop drive can achieve.
Please let us know what the you hear or do not hear.
I should also point out that the sonic graphs displayed the the Youtuber for comparison between the treated and untreated CD's are not symmetrical if you look closely.