As to recordings of Twain's voice -- one interview by Franklin
Whitmore printed in the Hartford Courant, Sunday Magazine,
November 26, 1922 has Whitmore stating:

"He made about three dozen records and then gave it up. I
remember these were placed in the Lincoln Trust Company
vault with other papers. I presume they are still in
existence."

Since these recordings were most likely different from the
recordings lost in Thomas Edison's fire in 1914, it is
possible some had survived into the 1920s when Whitmore gave his
interview. If they survived afterwards, they have yet to surface.

Barb