Drive at minimum, level at maximum and tone at noon - the classic way to add saturation to a high gain amp and clean up the low end at the same time. In this regard it is very similar to another classic: the Maxxon 808, but with a much tidier low end. I also recently compared it to the more expensive Fortin Hexdrive which sounds very nice, but in my opinion, the TS9 is even better. The switch is not the greatest, though. But I never really switch it off, so for me that’s ok.