The Declipper repairs analog and digital clipping, which is often the result of over saturation or A/D conversion artifacts, and is useful in helping repair audio that cannot be re-recorded. The histogram in the middle of the interface displays the concentrations of peaks at different levels in the audio, and if clipping is detected it will typically be displayed as a horizontal line stretching across the entire histogram display. The red line on the histogram indicates the Clipping Threshold, and any regions above the line will be repaired.
*Note: The region of repair above the threshold line is indicated by that portion of the histogram becoming darker. An important note with repairing clipped audio is that the declipping process can actually repair peaks to over 0 dB. The Declipper has two ways to handle this scenario, the first being the Apply Limiter Leveling checkbox at the bottom of the interface.
This will apply a limiter after the declipping process, with the limiter threshold set to the Clipping Threshold level. This will prevent any repaired peaks from going over 0 dB, while simultaneously normalizing the relative level of the audio.
If you choose not to use the limiter, the Declipper will automatically apply -6 dB of gain reduction prior to the declipping process in order to help ensure none of the repaired peaks go over 0 dB.
You can then adjust the audio level manually using the Output Gain control.