Looking for a good Boos Me-8 effect

Hi i have for a while a Boss ME-8 multieffect and as long as i tried to find a good distortion i haven't.. dou you know any one.. taht could sound like a DT's Petrucci sound??

By the way i also have a Zoom 505 if you want to share any tip..


I've made some cool sound in my ME-8 like sampling machin or thecno if you like i can share them

c'ya