The Somnial Cassettes label was, I think, the KP guys' label. There seems to be a pretty high cat number on the 3 that I put up, but I have a feeling they are inflated. Never seen or heard of another one, including the ones I have.
That WM/KP tape was basically a self made demo for the live collab they did at the Red Light District in 2011(?). I don't know how many copies were made, but I'm guessing not a lot. Matt just happened to put one in my hand, there was never a merch table with them on there or anything.