Roky Erickson/ Duane Aslaksen Guitar tone?!?!?

Long time fan of Roky Erickson and the 13th Floor Elevators. Stacy Sutherland was an amazing player but my question is about The Aliens guitarist Duane Aslaksen. I love his guitar tone on songs like Two Headed Dog , Night of the Vampire. Pretty much the whole Evil One lp. Any idea what his effects’s final chain was? I would love to get that sound. Thanks …. If you don’t know who Roky is your in for an awakening!