Used, albeit minimally, during the production of Professor Satchafunkilus and the Musterion of Rock:

"Turns out about half of the guitar parts on the record came from those demo sessions, as well as all of the keyboard parts. Everything else was recorded at The Plant Studios in Sausalito, Calif., in the facility's historic Studio A, which offers a 1,200-square-foot tracking room with a circa 1972 sunburst pattern on the sidewall and a much newer SSL 9000 K sitting in the control room. (...)

Satriani and crew spent three weeks mixing at The Plant, where Cuniberti bypassed the SSL altogether to mix exclusively 'in the box.' After three weeks, they moved to his home studio, affectionately dubbed Digital Therapy Labs, which offers a Pro Tools HD3 system and enough plug-ins to allow him to use the same techniques as he would during a traditional mix session."

In the video titled "Inside Real World Studios, Peter Gabriel's recording sanctuary," provided by The Vinyl Factory on YouTube, a Solid State Logic (SSL) XL 9000 K-Series analog mixing console is clearly visible at the 0:02 mark within Peter Gabriel's studio. This confirms the use of this specific gear in his recording setup.

"The album was among the first to be recorded in Jean's new Platinum Sound studio, whose rooms are split between Jean's work and outside clients. It's located on the second floor of the building that formerly housed Warehouse Studios on West 46th Street, once Manhattan's nightclub row, next door to Joe Allen's bistro and on the fifth floor, three levels up from the New York City offices of Solid State Logic. Small wonder that Platinum's two studios are populated by 9000J and 9000K consoles."

Kenji Kawai uses the Solid State Logic XL 9000K mixer, as listed on his official website.

In an interview on Bobby Owsinski's Music Production Blog titled "Thank You, Ed Cherney - Part 2," it is confirmed that Ed Cherney used the Solid State Logic XL 9000K.

I’ve used the pres on an [SSL] 9K and was really surprised how good they sounded.

In an interview video titled "Ben Grosse Interview and Studio Tour" by Produce Like A Pro, at the 12:53 mark, Ben Grosse confirms using the Solid State Logic XL 9000K console.