ok, I found that the slight amount of hiss is coming from the sabotage board. I kind of expect that as it has six huge gain stages. Ive only been running this into my headphones so it is likely a lower noise floor than my Champ. This combo kicks so much butt. I stand by my statement that the overall gain in the sabotage could stand to come down a bit, since I am pushing it with the booster. Insane distortion, at some point it goes from ultra creamy to fuzzed out mess. Play with the knobs until it suits you. Ridiculous range of sounds out of this circuit.