There you go, Bob! The issue is that the chart must be played twice and twice only for the opening bars to be played in two. I had some trouble with other charts and indeed, I found that there must be double bar lines for the player to recognize the different sections of the tune. I think that shin1ro's approach to writing the chart with repeat brackets and a coda is really clever and makes the chart work well with the player. I'm glad I could make a small contribution. This is what playing jazz is like, everyone making his contribution to the overall success of the music.

No--I couldn't tell what the effect of the double bar is on the drums, other than changing from two to four.