its an old peavey standard 260.i want to overdrive it at a lower volume level,but it has only one volume control,i looked into hotplates,but they damage ss amps.can i just mod a second volume switch into it?they make other versions of my amp with a master volume so i dont think those 260s would be terribly different.im sure somebody on here knows a hevck of a lot more about this then i do.