Someone over on Matrixsynth thinks perhaps Carl Palmer used some of the Moog drum modules featured in this post post on the Brain Salad Surgery album / tour, which is a very interesting development:
"via Suit & Tie Guy: "I believe this is one of the four machines built for the famous 1969 'Jazz In The Garden at MOMA' concert. after the show it was repackaged and sold to Eric Siday.
"it's possible and likely that these modules were also built for Carl Palmer's drum rig for the Brain Salad Surgery album. based on the panel controls it would seem reasonable to assume this. it would be great if someone close to Carl would find out if this is the case."
"Additional note via Suit & Tie Guy: "By 'these modules' I meant 'they pulled the films out and made a few for Carl as well' as opposed to the idea that Carl owned these pieces, which he did not."
"Update: turns out Carl Palmer's drum rig was not Moog but custom built. If anyone has more info on it, feel free to comment or shoot me an email via the email icon on the bottom right. According to this post he did have a MOOG 1130 Drum Controller, but no sign of it in the following video:
Carl Palmer Showing Off His Drums-10-21-73-Aquarius"