can someone please explain how the

[mesanomad100]

god **** loop works on a dual rec,ive played a few and the owners had a patch lead in the back of the loop from the send directly into the return,Why???Does this bypass the loop so that the master works as a master volume control and not a level send volume,I have read my mesa manual but dont really understand it,any help would be greatly appreciated,
cheers again guys


Euan