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You are after a low pass filter.

Low pass filter = lets 'low frequencies' pass through, and cuts out highs.

You can also do this with EQ and make a ever so small adjustment to drop the highest frequencies.

This unfortunately isn't easy and you can alter the actual desired audio as well in the process,
 
You are after a low pass filter.

Low pass filter = lets 'low frequencies' pass through, and cuts out highs.

You can also do this with EQ and make a ever so small adjustment to drop the highest frequencies.

This unfortunately isn't easy and you can alter the actual desired audio as well in the process,

Ok I understand.
How about when a character is speaking and another character exhales just at the end of her line. The breathing out gets in the way. What the best way to remove that since it's during someones audio.
 
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