“Voice Language” has three behaviors: text-based language detection, one fixed language, and automatic switching within selected languages.

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In “Voice Settings”, tap “Voice Language”. The current setting is shown on the right.

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When “Detect language from text” is selected, Voicepaper analyzes the text and decides the reading language automatically. This is the default setting.

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When exactly one language is selected, reading is fixed to that language. For example, selecting “Japanese” shows “Fixed: Japanese”.

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When two or more languages are selected, language detection is limited to those languages. For example, selecting “Japanese” and “English” shows “Auto: Japanese,English”.

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To return to the default behavior, open “Voice Language” again and select “Detect language from text”.