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Pronunciation control makes sure brand names, product names, and domain-specific words sound right before they reach your users. There are four ways to control pronunciation:
  1. Check dictionary coverage to see whether a word is already pronounced correctly out of the box.
  2. Send a custom lexicon with a Coda request to set how Coda pronounces each listed word or phrase.
  3. Specify a custom pronunciation inline on English Mist v3, using the Rime phonetic alphabet.
  4. Request a dictionary addition from the Rime team.

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Check dictionary coverage

Use the Coverage API to find words that are not yet in Rime’s pronunciation dictionary. The model still predicts a pronunciation for uncovered words, often correctly when the spelling follows common patterns. Verify uncommon words before they reach end users.

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Send a custom lexicon with Coda

Add a customLexicon list to a Coda request. Each entry pairs a word or phrase from your text with its pronunciation, written in X-SAMPA. Coda accepts a lexicon in English, German, Spanish, French, Italian, and Portuguese. In Arabic, Dutch, Hindi, or Japanese, request a dictionary addition or respell the word. Respelling is approximate. See Phoneme control for the format, the phonemes of each language, and examples.

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Specify a custom pronunciation inline

phonemizeBetweenBrackets works on English Mist v3 only. It is not supported on Coda or non-English Mist v3.
On English Mist v3, add inline phonetic strings with the Rime phonetic alphabet. Write the string by hand or generate one from a recording with the Phonemize API. See Custom pronunciation for the full reference.

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Generate the phonetic string from audio

Record the word (or synthesize it) and post the raw audio to the Phonemize API.
The response contains the phonetic transcription of the audio:
Drop any trailing punctuation token, then paste the string into your TTS request inside curly brackets with phonemizeBetweenBrackets: true. For example: {h0El1o}.

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Request a dictionary addition

If a word is mispronounced and you’d like it fixed at the dictionary level, reach out to your account manager via Slack or email, or contact sales@rime.ai. Rime’s linguists typically review and add new words within one week.

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What to check first

  • Brand names, technical terms, and made-up words are the most common sources of mispronunciation. Verify these first.
  • Re-check coverage whenever you add new or domain-specific content.
  • For flows where pronunciation control matters most, set each word’s pronunciation on the request. Use a custom lexicon on Coda, or inline pronunciations on English Mist v3.