Duane Allman is suspected to play on track 1.

Saxophone player Joe Arnold played on several tracks, recorded in Muscle Shoals, together with Duane Allman:
- Clarence Carter: The Dynamic Clarence Carter (1969 album)
- Wilson Pickett: Hey Jude (1969 album)
- Otis Rush: Mourning In The Morning (1969 album)
- Boz Scaggs: Boz Scaggs (1969 album)
- The Duck & The Bear: Hand Jive / Goin' Up To Country (1969 7"vinyl single)
- John Hammond: Southern Fried (1970 album)
- Duncan Pain: Duncain Pain (1970 album)
 

But he also released a number of 45rpm singles under his own name, two of them are released on Cotillion records, a subsidiary of Atlantic Records:

(click to enlarge)

Cotillion 45-44049 "Marley Purt Drive" / "More Today Than Yesterday"
(master numbers 17566 and 17569 were assigned on August 22, 1969)

2 other tracks probably stayed unreleased: "I'll Be Doggone" and "Put A Little Love In Your Heart"
(master numbers 17567 and 17568 were also assigned on August 22, 1969)

(click to enlarge)

Cotillion 45-44083 "Soul-Lips-Oh" / "Sunday In Muscle Shoals"
(master numbers 18850 and 18851 were assigned on March 30,1970)

(click to enlarge)

These tracks were recorded at Muscle Shoals Sound Studio and produced by Jimmy Johnson and Barry Beckett.

2 articles about Joe Arnold:

https://bluesjunctionproductions.com/joe_arnold_-_out_of_the_shadows

https://bluesjunctionproductions.com/joe_arnold_-_coming_home

And a 1-hour podcast:

https://www.soundsvisualradio.com/podcast/episode-154-joe-arnold/

This is a part of that podcast:

And although he was not present when the basic tracks were recorded, he mentioned that Eddie Hinton played slide on it, and possibly Duane Allman also played on the track.