He did use a Lowrey on most of the Soft Machine stuff. They had a lever to the side of the swell pedal that bent the pitch by slightly less than a semitone, and you hear his use that in a few places.
My Mom had a Lowrey with the pitch bender. It was called the “Hawaiian guitar” effect. It also had the “Repeat Marimba” setting that Pete Townshend used to create the backing loop on “Baba O’Riley".