In a perfect world my Sub 'n Up would already have a "grit" option. But, alas, I must toil to find the best OD for my pedal board. I really like the OC-3 Drive setting but it doesn't allow you to use it in the Poly mode. So, I'm wondering, does anyone here actually know for sure where the drive in OC-3 comes from? Blues Driver? OD-1, 2 or 3? It doesn't have to be the exact pedal but it would help me make a decision. Thanks.