Original sentence: A skilled performer can use his or her embouchure to considerably alter the tuning of individual notes or to produce vibrato, a pulsating change of pitch often employed in jazz.Clarinetists also find that when playing at a low volume in the altissimo register, they use the first finger, but, however cover the hole half-way (half-hole), making the notes more stable.Most clarinetists find that the altissimo E, fingered 2-3, thumb, register key, and E/A, is rather unstable.Special fingerings may be used to play quarter tones and other microtonal intervals
Edited sentence: A skilled performer can use his or her embouchure to considerably alter the tuning of individual notes or to produce vibrato, a pulsating change of pitch often employed in jazz, as vibrato in classical or concert band literature is rare.Clarinetists also find that when playing at a low volume in the altissimo register, they use the first finger, but, however cover the hole half-way (half-hole), making the notes more stable, and may also help intonation.However, certain clarinetists use vibrato in classical music, such as Richard Stoltzman   Special fingerings may be used to play quarter tones and other microtonal intervals.Most clarinetists find that the altissimo E, fingered 2-3, thumb, register key, and E/A key, is rather unstable and out of tune