I resumed playing 4 -5 months ago after pretty much a 30-year layoff since high school. I have run into a problem when I'm practicing for which I'm seeking advice. When playing, I sometimes completely miss notes in the lower register where it appears that lips are not buzzing. For example, my usual practice regimen includes a couple of Hering etudes. When the music progression goes to the lower register or even starting in the lower register, I sometimes do not get a sound. I try to compensate w/ my embouchure until the sound comes out. Not sure if I have something going on with the embouchure (hope I spelled this right), or if my chops are tired. I've been adhering to the following practice regimen for 45 minutes - 1 hour every evening - Long tones (7 - 8 different notes, beginning at low C, down to low A and back up to C). A couple of basic lip slur exercises/warm-ups (5 minutes) Colin's Lip Slurs (not trills yet) - I do approximately 8 - 10 of these Clarke Technical Studies - approximately 8 - 10 of these (I'm early into this so I'm on the first 3 - 4 pages). Double-tonguing in Arban's (a separate thread in and of itself) 3 - 4 Hering Etudes I also go for about 30 minutes in the morning where I pretty much do the same as above but I cut back on the Clarke (5 - 6 instead of 8 - 10), no double-tonguing, and replace the Hering Etudes w/ an interval study from Caruso. Lastly, after I've finished playing, I've noticed my upper lip has a ring on it - what is causing this? Thanks in advance for your comments.