We could not know what instruments captured on the recording sound like unless we had the reference of the actual sound of those real instruments heard live in a space. Without that reference, how could we possibly know if the recording is being presented naturally, or realistically, or convincingly? Even Ralph when making a recording is referring to the actual sound of the instruments that he is recording to judge if the recording is any good or not.
While I cannot explain this well, I believe that we are sensitive to sound attributes that give us clues as to the relative accuracy or "naturalness" of a system, without necessarily needing specific reference to the original sound that was recorded, or extensive experience of live music. This is the result of how our brain works in identifying "patterns".
As an example, we have no trouble identifying synthetic (computer generated) versus actual recorded voices, even if we have never heard the person's voice "live". Think about that...
At the end of the day, none of this matters too much. How you arrive to the conclusion that you enjoy your system is not that important. Describing a system as "natural" is probably simply a shortcut or summary. It is not that easy to describe sound.
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