Hello, I built a SOY lunchbox about 4-5 years ago which I love, it's my primary rig. That said, I don't play out anymore, and the amp is really just too loud for practicing in the house. I'm exploring ways to tame it and am considering the products at granger amplification, but I got myself confused. Is the SOY fixed or cathode biased? Sorry, I feel like I should know this, but with only the layout to look at I'm not sure. Thanks