Left Channel
1000+ Head-Fier
My DAC has a light that is supposed to indicate whether or not the file has approval of the studio or artist. Blue is approved and Green not approved
I think approval can also mean someone at the current label signed off on the release, without input from the artists or original recording engineers. In the example I was thinking of above, I can't imagine the original team would ever have agreed to make the bassist louder than the star musicians on sax and guitar. But In that case most of those involved have already passed away, and the remaining headline artist is 86 years old. Listening to the MQA version, I can't believe anyone thought carefully about this issue.