I'm trying to write down the melody of a song. It's in ABABBCB form, with a Coda. It also has a pickup measure. This is what I came up with. Is this correct? In the 2nd volta (ending), should it be double bar line (as shown) or the repeat sign (same as in 1st volta)? Is the "D.S. sign-symbol" without "al Coda" clear enough that one goes back to the sign and then the 3rd volta?
To clarify, the intended play order is: pickup, A, B, 1st-ending, A, B, 2nd-ending, B, C, B, Coda.