@steveroyle Ah! Alker says G.V. was initially played on a theramin (maybe your easier-to-play version?) but nobody could master it other than a particular trombone player When aformentioned trombonist was busy washing his hair or something Moog was called upon to integrate the slidy portemento effect into his nascent synths. And the rest is history. Or at least one version of history. So, if true, we should all be grateful the unavailablity of that particular trombonist!