He's either is screwing with you Bob or read right over the Duane Allman on wiki:
During the recording of the album, Duane Allman joined Clapton's fledgling band as a guest. Clapton and Allman, already mutual fans, were introduced at an Allman Brothers concert by Tom Dowd.[15][time needed] The two hit it off well and soon became good friends. Dowd said of their guitar-playing chemistry: "There had to be some sort of telepathy going on because I've never seen spontaneous inspiration happen at that rate and level. One of them would play something, and the other reacted instantaneously. Never once did either of them have to say, 'Could you play that again, please?' It was like two hands in a glove. And they got tremendously off on playing with each other."[16] Dowd was already famous for a variety of work and had worked with Clapton in his Cream days (Clapton once called him "the ideal recording man"); his work on the album would be another achievement. For the making of his biographical film Tom Dowd and the Language of Music, he remixed the original master tapes of "Layla,"[17] saying, "There are my principles, in one form or another."[15][time needed]
Clapton originally wrote "Layla" as a ballad, with lyrics describing his unrequited love for Boyd, but the song became a "rocker" when Allman reportedly composed the song's signature riff.[16] With the band assembled and Dowd producing, "Layla" was recorded in its now-familiar rock form. The recording of the first section consisted of sixteen tracks of which six guitar tracks: a rhythm track by Clapton, three tracks of harmonies played by Clapton (the main power chord riff on both channels and two harmonies against that main riff, one on the left channel and one on the right channel), a track of solos by Allman (fretted solos with bent notes during the verses and a slide solo during the outro[18]), and one track with both Allman and Clapton playing duplicate solos (the 7-note "signature" riff doubled in two octaves and the 12-note "signature" riff doubled in unison).[16][19] While recording this duplicate solos master track each player used one input of the same two-input Fender Champ amplifier.[18]