Hi
This is how I deal with 6/8 songs with BB. I Convert my midi file melody to 3/4, import in BB has a 3/4 song and select a waltz style with a 6/8 feeling. Just adjust the tempo. You convert the 6/8 notes to 3/4 by just doubling the value of the notes. If you wish, I can sent you my BB version.

Jean Guy