| What I've heard from the clips is that the OD on the big block is more a tight gain OD , not that fuzzy, what I hear in Leech seems to be a clipping input stage with tubes, and you can get that with a fulltone bassdrive in COMPCUT mode (important) or anyother gain booster pedal. Using a bassdrive in FM or vintage mode would not differ to much from the BB overdrive tone. But then Again, It's only based on what I hear and I don't own a big block ( I do own a walkabout so I know what it is to drive it's input stage) |