In last week's profile of Les Paul, we reported that his hits with Mary Ford employed a multi-track recording technique that Paul pioneered. Listener Joe Zannieri sets us straight on that. He writes, "The 'new sound' hit records Les made with Mary between 1948 and 1954 were made using multiple overdubs.
"The machine used was a single-track Ampex tape recorder that was given to Les by Bing Crosby after Les's 1948 car accident. He modified it by adding an extra head, which permitted him to pick up the sound off the tape before the tape was erased, and bring it back through the machine and record another track added to what was previously on the tape."
Zannieri concludes, "This was not multi-track recording, since there were no discrete tracks, just the addition of a new part into the previous mix."