First of all, thanks for all the effort to research and model this!
A friend of mine did some modeling as well, and came to the conclusion that there should be a treble increase, rather than the perceived decrease:
Even though the exact values differ from your (probably more correct) model, the effect is clear.
So, what could we really conclude from all this? That our models are too simplistic? It seems like they contradict your empirical tests? One indication of the complexity is the fact that in your real recording example, the 12th and 13th component is really louder in the rolled-off case, right?
Congrats! That's a nice guitar. In the future, just go out and play them. If you want to know the difference between two of these track them down at a guitar shop and play them. Nothing is better than your own hear.
Thanks for the info! My little brother is learning acoustic guitar. Until now, he has learned different techniques like strummer, flatpicking or travis picking. His music lesson is going well under the trained professional and hope so he learns well and play beautifully!
Yes ok! If you look at example 9, that's the technique I use there (although it's over a B minor instead of A minor). The only difference is that I go back down the arpeggio as well. Making the pull-off on the high E string, as well as the pull-off on the B string as well. So I use the same "pull off" technique on the high two strings. (See example 9 to learn the pull off on the high E string, then do the same on the B string, hammering on two frets above the index finger bar. If you'd play this on the B minor chord, then hammer on on the 9th fret of the B string. I end the whole thing by playing an harmonic on the 8th fret (fretting that note, C#, and playing the harmonic 12 frets above that note.. thats the 9th of the chord, which makes the whole thing sound very nice.. Ending on that 9th! Let me know if you need more help! Kind regards/E