I'm new to using an effects loop. I dont know the difference between serial or parallel or whatever. I'm buying a Roadster soon and want to use it. I have a carbon copy delay, boss ge-7, and mxr zw38 chorus. Which should be put through the effects loop and which through the front? Also, I've thought about adding an OD pedal to the mix. should that go through the front or EL? Thanks.