Can someone explain the difference to me of symmetrical and asymmetrical clipping in overdrive pedals ? I like the sound of the TS808,Boss SD-1,and Voodoo Lab overdrives. I'm not sure what my Fulltone OCD has. Does anyone know what type of clipping they use ? The reason i'm asking is i would like a local tech to make me some custom OD pedals and i'm not sure what's the difference. Thanks.