"We blow into the flutes."
I'm sure, at the time this was put into the course you would have found competent speakers on both sides of that argument. However, De'vID entered information into boQwI' saying that at the Germany qepHom last November, Dr. Okrand said that using -Daq with SuS implied that the air missed, that you were blowing at the thing, not into it. I don't remember that being reported anywhere, but if it's true then it lends strength to the idea of using the instrument as the direct object. I'll see if I can get him to expound on the mailing list.