Correct DC Offset

If the the average between the positive and negative wave peaks in your file is not zero, the result is inaudible low-frequency distortion. Although you won't be able to hear it in the .wav file, it will seriously degrade your compressed file, as well as introduce further distortion if other filters are applied to the uncorrected wave. The DC offset function corrects this problem, and should always be applied as the first step in optimizing an audio file..

In SoundForge, select Process | DC Offset.

Select Automatically detect and remove. Also, be sure to check the Create Undo option at the bottom right of the window.

Listen to the sample sound after applying DC Offset