This is a fairly overdrive "roots" that I use in addition to a tube amp "travel" Gretsch G5222. No fuss, we live branch and the overdrive is working through the guitar volume knob. The knob on the pedal for master volume. Good surprise, having held its nano size EHX has successfully integrated a 9V battery that comes with. No transformer to lug around on vacation. The sound is more than adequate, consistent with the brand. Very good value for money.