Hey all, I saw a production of "Jersey Boys" at the 5th Avenue Theatre in Seattle last night, and as I was looking around the light plot, I noticed some instruments that appeared to be Source Fours missing their barrels. From what I had known, the Source Four is not supposed to be operated without a barrel, though I never knew why. I was not watching the lights to see if they were used or not, but presumably they would have been struck had they not been used. What would happen if a Source Four did not have a barrel installed? Could I have been seeing something else and interpreting it incorrectly? Thanks!