Using a Kemper, pretty cool!
to get the world's shittiest guitar tone, indeed.
Gemini was written by King/Araya.This does not sound particularly great or bad from this clip imo. Slayer production has always been kind of shoddy. Hell, even Andy Wallace couldn't make them sound amazing. I bet they are all purist and are intent on everything sounding super raw. My favorite studio track of theirs in terms of sonics is Gemini off the Undisputed Attitude disc. Killer Hanneman track.
Gemini was written by King/Araya.