The Amos that I have had in the past did not have an effects loop. The whole concept of the effects loop is confusing to me. Over the years I have accumulated a lot of effects and messed sround with the effects chain order. No I feel like I am starting over with learning about why to use an effects loop and whah the benefits are. I have a tube amp the has an knob named fx on the back of the amp its a 2 channel tube amp. The other amp is a solid state head with two channels and two effects loops. The manuals do not go into much detail a out the fx loop other than showing where the return and send are. Quite a few pedals and do not know what to put into the fx loop the pedals which some I use a lot others rarely are as follows and in no particular order: boss noise gate, boss metal zone, boss distortion, boss chorus, boss flanger, boss overdrive, mxr phase 90, digitech whammy, Ibanez delay/echo, zakk wylde wah, boas 7 band EQ, and the mulch effects pedals are an old zoom 505 pedal and a new zoom g2.1dm Dave mustaine multieffects processor/pedal. Im pulling what little hair I have left out because I have no idea what should go I'm the loop and then don't know if thr order is just as important inside the loop like it is going directly into the amp. The whole loop thing is confusing to ms and I don't understand the purpose but if it gives me a better sound then I am all for it. Thanks everyone and sorry for the long post