gradual sound attenuation

Hello! I’m new to Audacity. I’m on Windows 8.1
If I want to make a gradual sound attenuation in a file in Audacity - how to do it?

If you want to attenuate down to silence, use the “Fade Out” effect (see:
or the “Studio Fade Out” effect (see:

If you want to fade to a lower level but not to silence, you could either use the “Adjustable Fade” effect (see: or the “Envelope Tool” (see:

Thanks, Steve! I’ll try my best :slight_smile: