If you take the Sable, and he tunes to that sound, if it's accurate for that it would seem the Martin would be accurate as well.
I would just take the Sable and if you need to adjust the hearing aids later for the Martin it shouldn't be a big deal.
As far as a new guitar goes, as I age, I find my 000-18 is becoming my favorite. Buying one you like, and keeping it, would also be a good option.
Stotes
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