"Robin Adair", No. 1 of Arban's melodies in the Art of Phrasing has a turn in measure 6. The direction of the 1st curve (down) tells me that it's an inverted turn. Am I correct? I've seen several videos of that melody played on YouTube, and it sounds as if they're playing a regular turn. In one video, a trumpet teacher states that it is to be played as a regular turn (base note, then next note up . . . ). What am I missing?