I'm making a backing track for Niel Gow's Lament for the Death of his Second Wife in 6/8 time and the tempo is 70 bpm. However, because the bars are split into 2, if I enter that as the tempo, the melody plays at double speed. If I change the tempo to 35 the chords play much to slowly. Is there some way I can resolve this please?

Thank you


Narayano