I suspect the fader effect referred to above is the engineer "gain riding" the vocal track. The engineer has worked with the singer to increase or lower the signal gain (volume) in anticipation of what the singer will do. The purpose for using this technique is to maintain a relatively constant vocal level. An alternative technique would have been to use a compressor/limiter to automatically control the signal level. Either technique can work, but most engineers would consider the manual gain riding a more "purist" method.
Recording engineers are for the most part magicians. In popular music they are trying to create the illusion of a real performance. Engineers take individual performances recorded at different times and frequently in different studios and electronically manipulate them so that it is plausible for someone listening to believe a real-time performance actually occurred. When performed by a skillful engineer, the electronic trickery is close to invisible. In less skillful hands its kinda' like seeing the mic boom in a movie. BTW, you don't need a high resolution system to hear these "flaws". If you know what to listen for you can hear them on any $1,000 system.
Recording engineers are for the most part magicians. In popular music they are trying to create the illusion of a real performance. Engineers take individual performances recorded at different times and frequently in different studios and electronically manipulate them so that it is plausible for someone listening to believe a real-time performance actually occurred. When performed by a skillful engineer, the electronic trickery is close to invisible. In less skillful hands its kinda' like seeing the mic boom in a movie. BTW, you don't need a high resolution system to hear these "flaws". If you know what to listen for you can hear them on any $1,000 system.