"Hex" featured guest musicians the Duke String Quartet, Animals That Swim's trumpeter Del Crabtree, Phil Brown on flute, and Neil Aldridge and Dave Ross on assorted percussion. The band also called in vibraphone player Pete Beresford (the father of one of Sutton's friends), of whom Sutton later recalled "(he) was this really, really old guy who used to play in a lot of old war time swing bands for kids going out for a dance in London. He hadn't taken his vibes out of his front room for fucking years, he just plays for his own pleasure, as a hobby. So we got him to come down and it was fucking brilliant, and I want to work with him again."