Chinese · Pronunciation Guide
ba, short and toneless. It softens a statement into a suggestion, and its weightlessness is precisely what does that softening.
ba
Permanently neutral in this use, and always sentence-final, so it never interacts with sandhi in either direction. Its one prosodic contribution is length: the particle is short, and lengthening it turns a light suggestion into something that sounds like impatience.
Listen: 吧
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我们走吧。
Wǒmen zǒu ba.
Let's go.
Listen: 我们走吧。
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我们走吧。 ends with two weak syllables in a row — men and ba — around a third-tone zǒu. Wǒ is followed by the toneless men, so no sandhi applies and wǒ keeps its dip. Then zǒu dips again and ba falls off the end of it at the same low pitch. The whole sentence therefore sits in the bottom half of your range, which is what makes it sound relaxed.
English speakers give this particle a rising, cajoling intonation — "let's go, yeah?" — because that is how English marks a suggestion. Mandarin does not: the particle is flat and the pitch simply continues from the verb. Adding a rise makes it sound like a question, and 吧 asking a question is a genuinely different construction. Keep it short, low and unaccented.