This in my clone of the Earthquaker Devices Hizumitas pedal with a modification adding a mids select switch. It's based on a slightly modified vintage Elk Fuzz Sustainar which was shares a lot of the same circuit as a four transistor Biff Muff. I designed my own etched and tin plated PCB for it and added a relayed (soft switch) true bypass. It comes in a polished and acid etched Hammond 1590B2 with all top jacks (Lumberg) with black Neve type knobs. I am only building this one (pictured for sale) and will not be building any more of them