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Ms. Toth spent much space discussing niceties of pitch and tuning undoubtedly lost on most listeners, advocating “1/4-comma mean-tone,” which required the player of the positive organ, Dongsok Shin, to retune his instrument between several numbers.

These include being HIV positive, organ transplantation or having type 1 diabetes.

Brian Gilling, the music director, led a small orchestra from the positive organ with a sure hand.

“The severe shortage of organs and imminent risk of death in some patients are the basis for offering a hep C positive organ to a patient who is not hep C positive,” said Dr. Adel Bozorgzadeh, chief of the division of organ transplantation at UMass Memorial, which has a reputation for performing transplants on high-risk patients.

Mr. Mortensen imparted tremendous energy to the young string and, at times, woodwind players, providing occasional keyboard flourishes but leaving most of the continuo work to players on a second harpsichord and a positive organ.