iSpeak is usefully by fluency-shaping therapy.
DAF stands for “delayed auditory feedback.
When you use the application, the signal of the stammerer’s voice will played back to him/her more slowly, which you can choose. The range goes from 20 to 300 ms (milliseconds).
FAF stands for “frequency altered feedback. When you use the application, the signal of the stammerer’s voice will pitched to a higher or lower Frequency, wich you can choose.
Both methods are recognized as an very effective way to develop good speaking habits.
Improvement in speech can rise up to 90%!
FAF and DAF can be used simultaneous to maximize the positive effect.
For best use, use the “Apple Earphone with Remote and Mic “ delivered with your iPhone, or order it from the iTunes Store.
Note: iSpeak cannot be used in combination with the phone function, this is a standalone application.

i-Speak Screenshots


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