Was listening to a track on Buckethead's album "Monsters and Robot's".
For those of you who haven't listened to any of his stuff you need to, really great, strange guy but brilliant musician.
Anyway, the second track "Stick Pit" is the tune in question and I swear it's Stewart . Can't find anything to confirm it and he's not listed as the drummer but I know Stew when I hear him. Also all the other tracks have different drum sound all together.
Interesting clues are that Les Claypool produced this album and plays bass on several track including this one.
Look it up on iTunes and tell me what you guys think, even the 30 second sample will give you enough to tell.