Stuttering is the brains inability to process the speakers NORMAL voice as they speak. Standard stuttering therapy is useless and often harmful. There are three ways that greatly reduce stuttering. (1) Hear your voice after you speak. This is called Delayed Auditory Feedback (DAF). There are many free apps with DAF. Also Casa Futera makes a wonderful DAF device. (2) Do not hear your voice as you speak. This is called Masking. Fluency Dynamics makes an excellent Edinburgh Masker (3) Hear a different voice as you speak. This is breathing and phrasing techniques. The McGuire program is excellent. (Please do not give up. There are options that greatly help most stutterers)