Noter attached to dulcimer?

Hi friends, I am new to this group. I have made a few dulcimers from kits over the years so I have an interest in how they are made. One question that came to my mind is this: Does anyone know of a dulcimer that has a noter attached? I was thinking such an invention with a noter that runs on a little track over the melody string might be helpful to some who for one reason don't have the full dexterity needed in playing? If there is not such a device, maybe some of you might be inspired to make one. It would also be great if such a device could be detachable. Such a device might hellp some like training-wheels do for a person learning to ride a bicycle for the first time. Let me know your thought sare.Thanks.