Mike Chunn was the original Split Enz bassist while Greg Clark had previously played in Space Waltz. Both had played in Citizen Band together. They had just quit the band before its last Australian tour. This was their only release together as Greg Clark & Mike Chunn. I'm So Up was written by Mike Chunn's fellow ex-Split Enz member Phil Judd. Who was at the time playing in The Swingers. The B-side, I'm Souped is credited as produced by Export Pilsener, I believe that. It must be one of the strangest remixes produced in New Zealand.
Recorded off of the 7" vinyl single
