For those who either have or have a knowledge of the Ampeg SVT 4 pro head i was just wondering does it have an effects loop built in similar to the Gallien-Krueger heads or how do you go about putting your effects into that head? I am currently looking at either the SVT 4 pro or one of the upper end Gallien Krueger heads to power the stack i'm in the process of putting together. I really like ampeg products and would honestly prefer the SVT 4 head just because it's the best around right now but usability is a concern not just raw power and i want to be able to have an effects loop in there.