When I first started on the clarinet three years ago after many years playing sax, I immediately noticed that no matter how much my sound improved (in the beginning) I still sounded like a sax player trying to play a clarinet. And the intonation was all over the place. As I started to make traction I was able to fix some intonation problems by smiling although I'd been told that would not be good for my sound. What are the differences in the two embouchures? What exercises could be used to improve the sound of the instruments? My worst nightmare is going from tenor sax to clarinet; it's so bad it almost makes me want to stop playing clarinet. Fortunately the bass clarinet isn't quite as bad.