Random sounds behind a dialogue track—such as beeps, squeaks, sirens, or coughs—can distract from the storytelling. Instant Process mode in iZotope’s RX audio repair software is the easiest way to Attenuate or Replace noises by selecting them on the Spectrogram and immediately applying the settings from the Spectral Repair module.
Here is an example of dialogue track with the sound of a truck backing up in the background. We can hear and see the beeps as narrow horizontal lines around 1 kHz, and some high-frequency brake squeaks above 5 kHz. The dialogue itself is represented by the curved lines between 100 Hz–1 kHz.