My latest lesson got into slurs a bit deeper. when I first looked at the page I thought "piece of cake",....well I was wrong. the whole page does mainly open valve slurs, with the exception of bottom of the staff E. anyways, as i work up, I found real quick, that the higher notes, C on up to above the staff, are not so easy. I can do them, but sometimes get stuck, and not sure what to focus on to correct it with.
So, my question is, if you had to explain doing the above, what would the main focus be for sluring up. extra kick of air, tongue/ embouchure change, other, all the above?