Shure UR4D+ is what he is using. As far as a buffer I made him one that is on the out of his pedalboard. It drives the cable Balanced and then at the rack it is converted to unbalanced to go into the head. A balanced line has no noise interference as his snake is a 100ft long.
What did you use to convert back to unbalanced going into the head? I use a similar setup coming out of my g-system and use an ebtech he-2 to convert back to unballanced. Is there a better way?