Did you hear that 1/4 second BANG (which was really the tail end of what you were soloing in step 2)? You can bet everyone on my stage and the first 15 rows of the audience did.
Never heard it before but I m going down there tonight to try to create it. Did the bang come from the house and monitor or a floor wedge cue mix? I'm going to go by the steps , I would think it also could show up during playback from saw session of all channels.