I don't found an effect

Hi there,
I’ve downloaded audacity, and when i want to use the effect “sound reduction”.
Can you help me ? I don’t know why there isn’t this effect :frowning:.
Thanks a lot for help :slight_smile:

Do you mean “Noise Reduction”? http://manual.audacityteam.org/o/man/noise_reduction.html

Yes it was that what i mean.