The 12" Synth seems like would come from possible outtakes that evolved from many of the songs off Face Stabber, especially the song "Captain Loosely." The two songs are both decent, they build and build upon themselves by layering many electronic sounds on top of each other, creating a decent ambient atmosphere. It's a step up from Clearly Invisible but still isn't as engaging as their first of the three, Dead Medic.
You can listen to Captain Loosely
Face Stabber