As several mentioned, my take as a 15 year frustrated Garageband bedroom sound engineer is you're expecting far far too much from your audiologist to tune in the specific tone of a Martin versus any other acoustic guitar.
But then, I've never had it done and don't know what their capabilities are. But if you have a sound editor app on your computer pull up an instrumental track done by a Martin and see what frequencies are the ones that make you think "Martin" and suggest that to your guy. Best of luck with the hearing aids, I've been borderline overdue for years . . .
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Larrivee OO-05, OOV-03, OO-44R & Strat
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