Nice to see Tull fans here. I had figured Rayblewit would be one (Pied Piper), wasn't sure about Biggles since the character is also known outside of Tull. Although our focus these days is our own stuff, my band also does a lot of Tull covers (in fact, we've played a bunch of Tull conventions). If you've got a request, maybe I can post a video. ;-)
Back to the topic at hand, Gerry Conway was the drummer for the Broad Sword album, but that one also included some drum machine... at least "Watching Me, Watching You" so that was probably their first use of drum machine on an album. After that, Ian Anderson's solo album "Walk Into Light" is entirely drum machine (and a phenomenal album, IMO), as was the subsequent Tull album "Under Wraps" but that one had an entirely different drum sound from WIL, one that I think embraced its artificialness rather than trying to hide it. It's a more abrasive sound that took me longer to get used to. Still not one of my favorite albums, but it's got a bunch of stuff on it I quite like. The funny thing is, when Crest of a Knave came out, my first reaction was being glad they had moved away from the heavy electronic sound, but over time, I found I actually went back and listened to Under Wraps more often than Crest! I wasn't really grabbed by another Tull album until Roots to Branches, though every album has its moments.