We have to be careful in our use of language - what Frank means by "less than satisfying" is not "easy on the ear" in the sense that you are using it.
Frantz, you asked this above "
The concrete is How do your define "Real"? Real in this sense means "realistic sounding" - in other words, is the illusion portrayed sufficiently convincing based on our experience of how things sound in the real world? We all have this same internal model/map/knowledge that we have built from our exposure to the sounds encountered in the world & how they behave. It's this internal model that we all compare a sound to & if there is anything unexpected found in this comparison our attention is drawn to this & we sense it as unnatural
I recently realised that this is very like how we learn to speak. We aren't schooled in grammar before we are able to form grammatically correct sentences. How does this work then? How do we learn how to speak in grammatically correct sentences? How do we internalise the "rules of grammar" without actually being able to state these rules?
We do so by hearing again & again, in the world, many different examples of how spoken sentences sound. At first we simply try to ape the sounds we hear & over time & many corrections later we have internalised this in some abstract model. It's to this internal model that sentences are compared to subconsciously when listening to speech (or forming our own sentences). It's not a conscious thing but when a word is out of place or a non-native speaker uses a slightly incorrect word, we immediately notice it.
This, I feel, is what's happening in our listening to reproduced music - it's being subconsciously compared to the "grammar of sounds" & anything which does not quite fit interferes with our sense of it being "real" & the more of these things crop up, the less "real" it is perceived to be & the "less satisfying" it seems.
I've been looking for a soundbite that explains these concepts & "grammar of sounds" is a good one