Burton,I have been using dgdgbd on guitar for sometime,so i can flatpick banjo tunes on a guitar using bum ditty when required,but i do the ty of the ditty on the top 1 string similar to maybelle carter guitar style,now with a left handed banjo[with strings changed so 2 string is next to short g stringand 4 string is the one nearest you everything can be transferred from guitar back to the banjo,BUT YOUR BUM DITTY WILL NOW CONTAIN THE HIGH G STRING.