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Almost everything about how your agent sounds is fixed in two places: the patience and tone settings in its Configure tab, and the words in its Prompt tab. Pronunciation is the exception, and that is fixed by teaching it the word.

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It talks too much

Why this happens. Nothing told it to be brief, and a long set of instructions encourages long answers. Fix it. Two changes. Set a concise tone in Configure, and add an instruction to keep answers to one or two sentences unless the caller asks for detail. Still stuck. Look for a list in your instructions that your agent is reading out. If you told it what you offer, it may recite all of it. Move that into knowledge, where it is used to answer rather than to announce.

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It interrupts callers

Why this happens. Its patience setting is too low, so it treats a natural pause as the caller finishing. Fix it. Raise the patience level in Configure and test with someone who speaks slowly. Older callers and anyone reading a number aloud need more patience than you do. Still stuck. Background noise on the caller’s end can also trigger this. Compare a call from a quiet room with one from a car before changing anything else.

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It pauses too long before replying

Why this happens. Either its patience setting is high, so it waits to be sure the caller finished, or it is running an action mid call and the caller is waiting for it. Fix it. Lower the patience level a step. If the pause happens at the same point every time, it is an action rather than a setting. See What are actions. Still stuck. Judge this on a real phone call, not a browser test. Pauses feel longer on a phone line.

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It says names and terms wrongly

Why this happens. Two different problems share this symptom. Your agent may be mishearing the word when a caller says it, or saying it wrongly itself. Read the transcript: a misspelled word there means it misheard. Fix it. For mishearing, add the word to the recognition vocabulary. See Teach it names and terms. For a word your agent says wrongly, that is the voice: try another voice, or spell the word phonetically where your instructions have it said aloud. Still stuck. Some voices handle some words better than others. If a critical word is still wrong, try another voice. See Available voices.

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It sounds flat or robotic

Why this happens. The voice is not a good fit for a phone line, or the tone is set to something brisker than you want. Fix it. Set a warmer tone in Configure, then try two or three other voices and compare them on a real call. A phone line narrows every voice, so judge it there. Still stuck. Voice cloning is not available, so if no voice in the library fits, tell support@brilo.ai what you are looking for.

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It speaks the wrong language

Why this happens. The language is set per agent, and the voice must match it. A voice belonging to a different language will not speak yours properly. Fix it. Check the language in Configure, then check the voice. After a language change your available voices change, so re pick the voice. See Set the language. Still stuck. Your instructions and your uploaded material should also be in that language. An agent told what to say in English tends to drift back to it.

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FAQ

Because it is not an ordinary word. Teach it the pronunciation rather than spelling it oddly in your instructions, which affects what it says as well as how it says it. See Teach it names and terms.
Its patience setting is too low, so it treats a pause as the end of a sentence. Raise it in Configure and test with someone who speaks slowly or is reading a number aloud.
Either patience is set high, so it waits to be certain the caller finished, or it is running an action and the caller is waiting for that. A pause at the same point in every call is an action, not a setting.
Set a concise tone in Configure and tell it plainly to answer in one or two sentences unless asked for more. Then call it, because chattiness is the thing callers notice fastest and the thing owners notice last.
A phone line carries less of the sound than your computer speakers, so every voice is narrower and pauses are more obvious. Always judge a voice on a real call before deciding.
Usually the voice still belongs to English, since changing the language changes which voices are available. Re pick the voice after a language change, and write your instructions in the target language too.
Yes. Adding a word to the recognition vocabulary affects only how reliably your agent hears it, so nothing about what your agent says changes. That makes it the safest fix available, and you add it straight from the transcript where it was misheard.