| Best way to learn (I found) is using the straw in a glass of water and getting constant bubbles just to learn the concept of circular breathing. After that, you can take it to the horn. The most difficult part is keeping a straight note. It's just a party trick and I'm sure there are much more important things you can practise. If you do want to show it off though, do it on a long trill as this covers up the fact that you can't keep a straight note.
Homby |