Peter Frampton in 1975 using a talk box, which works by placing the sound pressure from his guitar into his mouth, which he is then able to shape to sound how he
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Peter Frampton Live 1976 – Paul King Artwerks
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The Curious Tale of the Talk Box: Where Man and Woman Meets Machine. | GuitarPlayer
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Heil Talk Box | Vintage Guitar® magazine
Peter Frampton Recalls Steel Guitarist Pete Drake Introducing Him To The Talk Box
The Talk Box: Intriguing History of the Sound Effect | Articles @ Ultimate-Guitar.Com