Prooflistener

Often a prooflistener could clearly discriminate the words after repeated listening to a passage which the transcriber had previously found unintelligible.

Source: wiktionary

Wolfram Kandinsky, who does narration and voice-overs on television programs and played roles on “Radio Mystery Theater,” says: “The hard part is reading so much material without getting to rehearse it. The easy part is erasing and redoing lines you don’t think you did right.” SOMETIMES THE latter becames^([sic]) an argument between the reader and a “prooflistener.” All books are proofread.

Source: wiktionary

Time and again, her skill as a proofreader and her patience as a “prooflistener” helped her husband through rocky patches in his pilgrimage with the Popes.

Source: wiktionary