what are the switches?
The SPDT is a selectable mosfet clipping section
The DPDT is a high cut (different from the filter/tone control)
The nice thing is it's stock Rat until you use either. I personally welcome the mosfet clipping option. The high cut is okay on my C# tuned guitar. Haven't tried it on bass, oddly enough, even though that's sort of the target/purpose of it based on marketing fluff.