Hi everybody. For a class about old electronic instruments, I want to show my students the Emerson, Lake And Palmer video in which they perform a 43-minute version of "Pictures At An exhibition". I'd like to tell them about the instruments that Keith Emerson plays there, but I can't find detailed info on them, aside from the Hammond organ. Do you know that instrument that looks as a stick which produces a portamento effect and he uses for stage antics like wiping his a** with it? I highly appreciate if anyone can point me to links to good resources on Keith Emerson's 70s rig. Thank you in advance.