I also believe slowly in with the air and slowly out. The air tends to go out the way it goes in. That being said: About two years ago there was a discussion on here with the same subject and the pros were saying to take that prep air in quickly. In 4/4 time you would think 1,2,3,4,breath . You get a half of beat the take in the air. I remember thinking, this is the opposite from what I was taught. They also went on to talk about exercises written by famous people saying to play a measure and rest 3-1/2 beats and quick breath. Maybe I'll do a search and see if I can find it. It's pretty old and stuff was dumped a while back.