Prob not bud. I figure he has an under developed vocal cord or ruptured ones. Sounds like just a birth deformity.
I have heard of poachers clipping the vocal cords on hounds and utilizing bells on their collers for location. But I would say attempt to make him a one man show or train your help dogs to sing along to jingle bells.
With the technology of garmins. You can utilize him effectively as a strike dog by himself or get a youngster to pair up with him that wont leave his side. Then let the youngster sing the song to your bay or catchdogs after he finds em.
Good luck.
I agree, i think you last paragraph is spot on, if he is good enough build your pack around him, get 1 or 2 young dogs thatll stay by his side.
"the sun is shining somewhere in texas" -Jason Boland