Did Frank Sinatra or Dean Martin use their "real" voice?

Saw them both l"live" along with Sammy Davis at The Sands in Vegas lots of years ago. Yes they all used their real voices.

I agree with PA because I saw them live back in the 60's at the Sands and they all used their real voices. No one could sing like Deano with that slurry mellow sound.

You got a truthful answer, and you still doubt, don't you?!

Frank was and is the greatest pop singer in the world, Dean was entertaining and great fun, I knew them both, and Sammy too. Music was music then.