It’s possible your chain just doesn’t complete or completes incorrectly. Step 1 Noise Reduction is not a stand-alone tool. You have to tell it what the noise is first and then apply it. When I try to do Noise Reduction by hand but out of order, it just doesn’t complete. The “OK” button is gray.
It’s also possible to call Equalizer but get the wrong curve. That’s one reason Chains is not recommended for Mastering (yet).
Open a chapter.
Select the whole timeline by clicking just right of the up arrow.
From here, I followed Mastering.
Drag-select a portion of the noise.
Effect > Noise Reduction > Profile.
Select the whole show by clicking just right of the up arrow.
Effect > Noise Reduction 6, 6, 6 > OK.
That’s very gentle Noise Reduction. Too high a value an affect your voice.
Effect > Noise Gate.
As long as you don’t close Audacity, I believe it retains Noise Reduction Profile, so you don’t have to get another Profile—I think.
So the second time you do this, it’s:
Open the clip and select it.
Effect > Equalization > OK.
Effect > RMS Normalize > OK.
Effect > Limiter > OK.
Effect > Noise Reduction > OK
Effect > Noise Gate > OK.
I get about 25 seconds total. It totally looks like you should be able to automate that, but we have had problems.
It’s possible Noise Reduction is going to fail. If it does, you’ll have to drag-select a fresh portion of Room Noise, and then apply it and continue on with the stack.
I don’t hear any Frying Mosquitoes, so you won’t need Mosquito Killer. Mosquito Killer sucks out little voice tones here and there to get rid of microphone USB errors, so that one can affect your voice, too.
See if you can duplicate my work. Post back if you have problems or get lost.