As requested by @ARM here is Gilbert in his 2nd appearance on his first episode of SNL 1980. His first appearance was him doing a Yiddish voice as "Leo Waxman" which wouldn't work for our purposes. This is the closest I've heard to his real voice from a few minutes of pulling the episode and skimming through the clips. He seems to be in-between what we hear on Stern and his normal voice. If anybody can tell me from this IMDB listing which character is closest to his real voice, I will pull it.

