Yell discovered as a teenager that he could change the pitch of his voice to hit a note that would allow him to incapacitate others or if taken high enough could actually kill. The note when used by Yell can also be pitched to shatter walls or stop cars. The only problem Yell has is that first time he discovered the note he also shattered his eardrums. As such he has too be extra careful about using it and has on occasion had the note get out of his control. Even with this risk he is still determined to rock and to bring the battle to crime.