Easiest way to find out what the problem is would be to get out your practice chanter, sit the way you were sitting yesterday, and play. If you experiment a little, you'll find out whether it was the way you were sitting or maybe the way you were hunched over. It also may be that you were really tensed up. If the latter, now's the time to concentrate on relaxing when you play. When you get your pipes, one of the hardest things to learn how to do is have your bag arm working hard and your upper arm, back, and diaphragm muscles tense but have your fingers loose.

Frankly, I'm envious that you can play your practice chanter that long without your lips blowing out!

Barb