Identify the language you actually want to hear
An English heading above Vietnamese paragraphs does not make the passage English. Skim the material you plan to listen to and mark its genuine language changes, including names repeated throughout the document. This small editorial pass gives you a sound basis for choosing a voice.
FolioTone includes Vietnamese voices and Clear English for English material. Changing the interface language does not automatically choose the appropriate voice for a document. Before generating, check the voice selected for the current task rather than assuming the choice from your previous session will suit this one.
Split at a change of meaning, not every line
For a lengthy English quotation, prepare a separate passage with Clear English and use a Vietnamese voice for the surrounding explanation. Keep complete sentences and their punctuation together. An audio section should open with enough context to make sense and end after an idea has reached a natural stopping point.
A short English term embedded in Vietnamese can remain in the sentence for a trial reading. If it becomes confusing, revise the listening draft or separate the passage. There is no need to make an individual audio file for every foreign word; excessive fragmentation makes playback harder to follow.
Preserve order with names and a written outline
Name sections in sequence, for example “01 explanation,” “02 English example,” and “03 notes.” Use the same approach when saving exported files in a folder. A clear naming system becomes particularly useful if you later move the audio to a different player or another device.
Keep a text outline containing your original passages in the intended order. Note any changes made to names or abbreviations for speech. When you update the source document, this written record explains the difference between its original spelling and the wording in the listening version you previously checked.
Treat voice transitions as an editing decision
Listen to the end of the Vietnamese section and the beginning of the English section before preparing everything. Check whether the change sounds intentional and whether the listener can follow its purpose. A short introduction written into the content can provide context before a long quotation or example.
FolioTone does not automatically switch voices when the language changes inside a passage. Treat this as a manual voice-selection workflow, and keep the app in the foreground during generation. Reviewing a few connected sections at a time helps locate mistakes without repeatedly preparing the entire document.
TRY IT WITH YOUR OWN WORDS
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FolioTone works on iPhone and iPad with iOS 18 or later. Voice, OCR and export limits depend on your Free or Pro plan; check the app for current limits.
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