Sorry guys one more thing. Forgive my ignorance, but what is an FX loop? I have a compresser, fuzz, distortion, chorus and delay which goes between the amp and guitar obviously. I take it it's a different way to get them in the chain? What's the benefit of having a loop?
Not obviously between the guitar and amp if you got a loop mate ;)
The Fx loop is a circuit that allows you to place effects between the gain and the powerstage of the amp, so after the signal recieved itīs input gain from the valves you can further change it before it goes to the powerstage and out of the amp.
There are effects that make sense in the loop and some that donīt. For example an OD in the amp is not really a great thing (you wanne push the front of the amp). Things like a chorus or a delay might be nice there though, EQs also.
It is a matter of taste.
Itīs like playing around with the order of the pedals you already got. Placing the delay or chorus in front or after the distortion will give you very different results. Try it! If I recall for example Edge from U2 does the unusual thing and places his delay after the distortion and got very famous sound with that.
The FX loop is just another option in forming your signal chain.