Since I have been working on keeping my embrouchure more set for the upper register ( for lack of a better description), I can play with alot less movement. It took a little bit to get the lower register full again but now it seems to be coming along .. so basically I can play a high C and jump down to a low C and nail it. Now the weird part ... during my warm ups the low register ( C down ) and upper from second line G are fine ... as far as warm ups go but there seems to be more work required to get the E and Eb out ... they seem tight. Anyone have any experience with that or know if this is common? Once I am warmed up it's pretty much a non issue ... I just thought it was a little odd.