When the pedal is off it is truebypassed. On with the gain set to min and the thing on clean its a great buffer with a super high input impedance and a super low output. Last month a couple of my crew members adjusted the FAT mode to be well more fat. I really love the result and couldn't be more proud of that pedal.
Hi off all the pedals I bought the last years the only one I still use and will always use is the red Super Chili Picoso, IMHO its the best clean boost around for me.
Trust me its going to be a legend