Two speech recordings reach the same highest peak, yet one still feels much louder through most of the conversation. That is a clue that the largest instant in a waveform and the overall listening experience are different questions.
Peak normalisation is useful when its purpose is clear. It is not a promise that every recording will become equally comfortable to hear.
Know what the control changes
The Audacity manual describes normalisation as applying a gain change so that the highest peak reaches a chosen level. The tool can also address DC offset. Its peak adjustment is distinct from continuously changing the level within the performance.
A sudden loud sound may therefore determine the adjustment even when most speech is much quieter. Listen to the whole passage rather than judging the result from the peak value alone.
Do not expect it to remove noise or repair a performance
Increasing a recording’s level also makes its existing background more noticeable. A single overall gain change does not make a distant speaker move closer to the microphone or resolve every difference between speakers.
Identify the actual problem before choosing another processor. Is the issue background noise, a brief unwanted transient, inconsistent delivery or a delivery requirement from the destination platform?
Keep stereo decisions deliberate
Audacity provides an option to normalise channels independently. The manual notes that this can alter the stereo balance. Do not enable it simply because the option exists; consider what the channels contain and what relationship you intend to preserve.
Check the delivery context
Use the receiving service’s current specifications when it requires a particular loudness or peak limit. There is no single setting in this article that replaces those requirements.
Finally, listen to the exported file at a comfortable level, including quiet speech and transitions. Our file-before-sharing checklist keeps that last step tied to the actual deliverable, rather than the reassuring appearance of an editing timeline.