Well, it's an invented instrument, which I didn't invent, btw, whose name is a benkrugaphone ... technically the krug should have an "e" between the u and the g
Karli, I'm not familiar with the circle of fifth method. I learned to go by the interval difference between the transposed instrument and concert C. Is there a link to learn about the Cof5 method? It's always good to know more than one way.KP