Seth Firkins, a sound engineer who’d been working with rappers on the Atlanta scene for years, passed away in his sleep on September 23.

Firkins was especially close to Future, and had worked as the engineer on the rapper’s 2012 Pluto 3D album. Some other major credits include American Gangster by JAY-Z and The Appeal: Georgia’s Most Wanted by Gucci Mane. He also worked with Young Thug, Rihanna, Ciara and Trina.

Future shared a touching response on social media, writing a lengthy Instagram caption to celebrate the life of his friend.

“I always gave racism a cold shoulder because my real brother Is a white guy by the name of Seth Firkins,” he wrote. “I got a call saying u died in your sleep? First thing came to my mind is, why are you sleep at 5am? That’s when we record our best shit & I tell u ‘don’t’ fall asleep we got more work to do.. but somethin told me I should’ve been at home recording for some reason.”

“I was saying this in my head, then bad news beat me home! I love u beyond this post, I will cherish u forever big bro, I just wish u would’ve text me & told me u was going to sleep and i wasn’t going to be able to wake u up this time…the family will miss u 1000%!! No kap in my game kid, rest well my brother. Rest well.”

Future wasn’t the only one to pay his respects to Firkins, who passed away the age of 36. Other Hip Hop producers and sound engineers, such as Mike WiLL Made It and Alex Tumay shared their grief, with Tumay saying “the world is going to sound so much worse without him.”

Naw Fr, and you can never be replaced big dog, 1 of a kind fr, REST EASY OG, LOVE ! RIP @sethfirkins 🦅

A post shared by Mike WiLL Made It (@mikewillmadeit) on

No cause of death has been reported.