He's an incredibly talented bloke. Warren said (during their estrangement) that he always hugely admired Chris's talent as a bassist, contributor and synthesist. Warren regarded him as world-class, probably the finest bassist he'd ever worked with.

As for playing bass synth and guitar at the same time: wow! I've never seen him do that before Sheffield. In the few times I saw them play Astradyne live in the 80s, he always played bass guitar although he's able to play both now as it probably requires only open-string playing. Listen to his bassline on it and tell me what you think.