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Because they're pronounced differently.

I did tell you: "вон" is like "narrator" and "вонь" is like "neat"

We need someone to record them.

You will always speak without hard or soft sign cos they're not pronounced at all! They have no sound.

But for example,
"вон" and "вонь".

The "н" in the first one is pronounced hard. The...

Actually they're never spoken by anyone. They just show whether the previous consonant must be hard or soft.