Chinese · Pronunciation Guide
dzoh, low and sagging. A "ds" onset at the teeth, then a vowel that starts fairly unrounded and closes toward "oo".
zǒu
What follows decides whether this dips or rises. Zǒu ba leaves it low, since ba is toneless; zǒu lù leaves it low too. But wǒ zǒu puts two third tones together and forces the pronoun to rise. As a very common verb of motion it turns up in sandhi environments constantly.
Listen: 走
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他走了。
Tā zǒule.
He's left.
Listen: 他走了。
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他走了。 is a compact demonstration: tā holds high, zǒu drops to the bottom, and le trails off toneless at that low level. The interval between the level tā and the floor of zǒu is the whole content of the sentence's melody, and squeezing it makes the sentence sound flat and uncertain.
Reading z as English z is the standard problem, giving a buzzing "zoh" without the stop closure. Touch first, then hiss. Aspirating instead gives cǒu. And the tone tends to be under-produced because the syllable is short and the verb feels casual, but a mid-level zou reads as a first tone and does not mean this.