Ok I have a triple x head that I play through at rehearsal's we play 70's 80's 90's rock anything from Zeppelin to Scorpions to Tesla most of it is harder rock. I am needing that half crackle plexi sound or just breaking up sound. Of course the x can't really do that. I have a behringer vt-999 and a DOD malmsteen pedal in my closet.

I would like to know if anyone has the knowledge on how do a simple but effective mod for either one of these pedals and can I but the parts at radio shack?
Thanks any help would be appreciated