I have recorded all the chapters of my new book. When listening to it, I have noticed that there are different levels of volume between different chapters. How could I, in an easy way, change so that all the chapters have the same volume? I do not want to record them all again. Hoping for a helpful reply. I am a novice on this.
Well… By-ear it’s pretty easy…
Run the Amplify Effect on all of the chapters/sections and just accept the default. This will normalize/maximize files for 0dB peaks. (They will all have the same peaks but they probably won’t sound equally-loud.)
Listen to them all and if there’s a difference choose the quietest-sounding one as your reference.
Run Amplify again on the louder tracks and enter a negative dB amplification (attenuation) to match your reference (by ear).
If you want to boost or attenuate smaller selections you can fade-up or fade-down with the [u]Envelope Tool[/u]. (It is usually best to “fade” rather than making sudden adjustments.)
But if you are going to publish the book you’ll need to get familiar with the ACX requirements and the [u]ACX Check plug-in[/u].
This gets a little complicated so I’ll just give you some background to get you started…
The RMS level is a kind of average and it correlates well with perceived loudness.
The peak level does not correlate well with loudness. (The “digital maximum” is 0dB, but ACX wants you to keep the peaks below that.)
When you amplify or attenuate (linearly) The peaks and RMS change by the same amount… If you attenuate by -3dB, the peaks and RMS will both drop by 3dB. This causes lots of frustration when trying to get both the peak & RMS levels in spec.
Compression and/or limiting can be used to bring the peak & RMS closer together. But, since these techniques are normally used to bring-up the quiet parts, they also bring-up the background noise level.
What he said.
If you publish with ACX, they have some stiff requirements for sound quality. If you’re doing it as a free-wheeling podcast, then close is usually pretty good.
Let us know.