Increase RMS/Volume without undoing previous Amplify

Assuming you’re using Audacity 2.1.3 or higher.

We have a (new) pre-baked tool called RMS Normalize that can directly set RMS. Between that and Soft Limiter, you can put your presentation pretty much wherever you wish.

Are you shooting for ACX AudioBook conformance?

That tool will “force” your clip or chapter to a set value. -20dB will put you in the middle of the ACX range of -18 to -23.

Follow that up with built-in Effect > Limiter.

– Effect > Limiter: Soft Limit, 0.00, 0.00, -3.50, 10.00, No > OK.

-3.5dB was chosen instead of -3dB (the official limit) in order to avoid missing conformance in the MP3 conversion step which can mess up volume levels.

I expect those two to push your performance into compliance without being able to hear any change save possibly a volume shift.

Feel free to change the settings around if you’re using a publishing service with differing conformance standards. Post back if you have troubles.