This was my favorite part:
Shows seemed to generally fit on two 14-inch reels and a ten-inch reel or two. Tape changes were quite interesting: We did not have a lot of room and had practiced this quite a bit, and it took three of us to do this at high speed. In an effort to not run out of tape during a performance, we had an indicator-light system of communication. Under Jerry’s monitor wedge there were three small lamps mounted on a piece of wood. The lights could be lit from the truck. A green, yellow, and red light: Green = we are rolling and in record; yellow = if you can wind it down and stop, we need to change tape; red (if, in fact, the band did stop for us) = changing tape, not in record.
This, of course, did not fit in with the way the Grateful Dead worked. There were not going to be any rules. Early in the tour, I tried a “yellow,” asking for a possible wind-down of the jam so that we could change tape. Even though this had been an idea we had discussed Stateside, Jerry was having no part of it! As I switched on the yellow light, I looked at Garcia on our 13-inch B&W TV monitor. He looked up at the camera, knowing I was watching, and simply smiled and nodded no in a very friendly way. Don’t f*** with the music!
