If the tone of your clarinet has lost something (clarity) or you are now finding that your left hand upper register is flat and it it is harder to focus the sound in the g-c range then check your register key tube.
I use this daily and have just renewed my membership. A years membership is the same as buying 1 book at the music store. The music comes with accompaniments at different tempos and the quantity of music you can download and play is staggering. For a family with kids in music it would be one of the best investments you could make
Private performance April 14
PGSO April 21
Wind World Alban classical school show April 23 and 30