Thinking of getting an OCD to replace the gt-500, just not a good pedal to my ears. The OCD 4 seems cool, but didn't know if one of the earlier versions might be better. Its going to be primarily for a high-gain tone in a Germino LV55 and as a solo-boost with other Marshall amps. Other than the boost, I can't stress how much I don't like the tone of the gt-500. Any thoughts??????????