3. The method of claim 1 , further comprising: generating the third synthesized speech corresponding to the supplemental text, the third synthesized speech having different voice parameters than at least one of the first synthesized speech and the second synthesized speech.
1. A computer-implemented method for navigating secondary content during a text-to-speech process, the method comprising: outputting first audio including an audio tone preceded by first synthesized speech and followed by second synthesized speech, the audio tone corresponding to an indicator of a first footnote located in a string of text, the first synthesized speech associated with a portion of the string of text prior to the indicator and the second synthesized speech associated with a portion of the string of text following the indicator; detecting first contact on a touch-screen of a computing device within a first period of time following output of the audio tone; determining that the first contact corresponds to a predefined first arc gesture, the first contact extending along both a horizontal axis and a vertical axis from a first point to a second point, a difference between a first horizontal coordinate associated with the first point and a second horizontal coordinate associated with the second point exceeding a horizontal threshold in a first direction relative to the first point, and a difference between a first vertical coordinate associated with the first point and a second vertical coordinate associated with a midpoint of the contact exceeding a vertical threshold; selecting the first footnote in response to the first arc gesture; identifying supplemental text associated with the first footnote; and outputting third synthesized speech corresponding to the supplemental text associated with the first footnote.