8. The computer-implemented method of claim 4 , wherein the method further comprises: detecting second contact on the touch-screen; determining that the second contact corresponds to a second arc gesture, the second contact extending along both a horizontal axis and a vertical axis from a third point to a fourth point, a difference between a third horizontal coordinate associated with the third point and a fourth horizontal coordinate associated with the fourth point exceeding a horizontal threshold, and a difference between a third vertical coordinate associated with the third point and a fourth vertical coordinate associated with a midpoint of the second input exceeding a vertical threshold.
8. The computer-implemented method of claim 4 , wherein the method further comprises: detecting second contact on the touch-screen; determining that the second contact corresponds to a second arc gesture, the second contact extending along both a horizontal axis and a vertical axis from a third point to a fourth point, a difference between a third horizontal coordinate associated with the third point and a fourth horizontal coordinate associated with the fourth point exceeding a horizontal threshold, and a difference between a third vertical coordinate associated with the third point and a fourth vertical coordinate associated with a midpoint of the second input exceeding a vertical threshold. 11. The computer-implemented method of claim 8 , further comprising: outputting third audio including third synthesized speech associated with a portion of the string of text following the second synthesized speech.