This Pedal Has A Secret Switch On The Inside! - YouTube
Toggle Switch mod on the MXR Classic OD : r/diypedals
MXR Gt-od internal switch vs Mxr Zw44 on Marshall Jcm 800 - YouTube
Can I modify my MXR classic overdrive's voicing to be more suitable for bass? | TalkBass.com
Guitar FX Layouts: MXR GT-OD
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
MXR ZW/GT/Classic OD | DIY Fever
MXR GT-OD: the best value, most transparent Ts pedal ever? | Page 2 | The Gear Page