those are great. i once ran one of those in front of a marshall bluebreaker combo and really nailed the kill em all tone believe it or not.Ibanez Tube King TK999US. It's the overdrive/boost I use in front of my tube amps 95% of the time Just enough gain to get a hint of break up, pull back on the bass for a bit of low cut, mids at 75%, and crank the output.