Pedal de efeitos de guitarra overdrive MXR GT-OD : Amazon.com.br: Instrumentos Musicais
Dunlop GT-OD M193 Overdrive Guitar Effect Pedal for sale online | eBay
The MXR classic overdrive pedal has a hidden switch inside that changes to the Zakk Wylde overdrive. I've seen people mod their own switch for it, but I just drilled a hole