It probably is a Mumpower sound board that can be switched to Cajun, Bavarian and Mexican. Now if he would have used a laughing boxcar for the batteries … things would be “just swell”. 
Dave Healy said:
Agreed - Vimeo's better.Both of 'em massacre the RS-3’s sound crossing the bridge - sounds just like an accordion!
It must be due to Warren’s crew is running that RS-3 backwards. Its making them dizzy!
-Brian
Warren usually uses Calypso in his “Dash 3.” That might be the problem.