Do any recordings exist of the Telharmonium?

Thaddeus Cahill’s Telharmonium, invented in the late 1890’s, is considered to be the world’s first synthesiser. Do any recordings of the device exist?

A review of Magic Music from The Telharmonium from 1995 says that no known recording exists. Is it possible to make an educated guess as to how it sounded?

I’m going to bump this once, just in case someone with an interest in dynamophones/telharmonia happens upon it.