I've recently been looking for a Tobias Growler to pick up, and I have, in my search, come up with a question. Maybe you guys can help me out. What are differences between the one that was recently re-released, and the older ones. The only noticeable difference is that the older ones have two switches, while the re-released version has a knob instead of them. Does anyone know how the tones differ from one to another? Thanks guys.