Originally Posted by: John Vacher

But how do you do that without stopping the song, and using my hand to turn the knob on the amp from clean to r-fier(chugga chugga overdriven sound)?

https://www.guitartricks.com/tutorial.php?input=2290

FWIW, many guitarist do also use footswitches to change channels on the amp or engage/disengage pedals. [br][br]Hope this helps!