From the Speechify iOS app, access a file within your library
On the listening interface, locate the "human" icon at the bottom left and tap on it
Next, select the preferred voice or language.
Note: The Speechify app can read in any of the languages that are listed. For instance, if one possesses a text written in Italian, selecting the Italian language will result in the text being read in Italian. Furthermore, if the Italian voice is utilized to read texts written in English, the application will read the text in English with an Italian voice or accent.