12. The computer-implemented method of claim 5 , wherein the secondary content includes at least one of a footnote, an endnotes, a definition, a synonym, or a translation.
5. The computer-implemented method of claim 4 , further comprising: outputting third audio including a second audio tone preceded by third synthesized speech and followed by fourth synthesized speech, the second audio tone associated with a second indicator of second secondary content located in a second string of text and based on a type of the second secondary content, the third synthesized speech associated with a portion of the second string of text prior to the second indicator and the fourth synthesized speech associated with a portion of the second string of text following the second indicator; determining that a duration of time has elapsed without detecting the first arc gesture; and outputting fourth audio associated with a third string of text following the second string of text.