@spenav ”How would you know the recording is changed unless you were at the recording studio or the live venue”
l would never know. I was talking about “if” a system did not actually reproduce the intended information or adds its own signature it is not true to the original.
“There is a difference in adding things or restoring things that were actually lost”
I’m not sure if the “adding things” you refer to is in agreement with me or not, but the restoring things that ARE “actually lost” l am not sure is possible. The only way l would think you are talking about is maybe an extra recording element (or track that was part of the master) that has been recently rediscovered but was never included in the original mix?
An example that springs to mind of a lost, or in this case a rediscovered element is the 2.0 unlimited release of the soundtrack to “The Omega Man” When the original first issue “limited edition” was released by Film Score Monthly 15 years earlier, it was not known that a third (centre) track of the keyboards/Synthesisers existed. The keyboards, a key (pun intended) important part of the score were quietly there on the original CD, but only recorded by the far left and right track microphones. Restoring the integral middle centre microphone elements with the higher keyboard levels brought the original soundstage ambiance back to that which was intended.