Chinese · Pronunciation Guide
tsoong with a real puff of air, rising in pitch. The initial is an aspirated "ts" at the teeth, and the ending is a rounded back nasal.
cóng
The rise is fixed in every context. Where 从 matters tonally is as the opening word of a phrase — it sets the starting pitch for everything after it, and because it ends high, whatever follows tends to begin from a high position rather than from neutral.
Listen: 从
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我从上海来。
Wǒ cóng Shànghǎi lái.
I come from Shanghai.
Listen: 我从上海来。
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我从上海来。 places cóng between wǒ and Shànghǎi. Wǒ keeps its full dip since cóng is rising. Then Shànghǎi has a falling shàng and a dipping hǎi, and lái rises at the end. So the sentence climbs, drops, dips and climbs again — and the two rises, on cóng and lái, bracket the place name neatly.
The letter c is the problem. Almost every beginner reads it as English "k" or "s" and produces "kong" or "song", neither of which is the word. It must begin with an audible "ts", the sound at the end of "cats", and it must have breath behind it. Under-aspirating turns it into zóng instead. The rounded -ong is the secondary issue: an English "awng" is too open and unrounded.