Carlaz,
The GS-1 is a single pickup twin cutaway guitar (like an early sixties SG Junior) so it'll just be the 'Pig OR a Mule but not both. I'm going to see how the 'Pig sounds and take it from there.
Knowing me I'll like it as it is, then I'll have to get a Mule (or Mules) to try in something else!
I'm very tempted to get a set of Mules for my HCSB Les Paul Standard (Slash/Hawkins tone) and a Riff Raff for my Cherry Red Gordon Smith SG-1 (Angus tone)...