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So I've tried googling and diystompboxes didn't help me this round. I'm curious what modification Keeley does to increase the gain from tubescreamers? I'm actually using a BB preamp, but since I've heard the circuits are similar, I figured maybe a simple part swap or extra little something something might be applicable, because it would be nifty to have a bit more drive on tap.

Again, not super familiar with either circuit, but I've done some simple things in the past and figured it was worth asking.