| MP3GainExitedEventArgs | Contains the event data of a Exited event. |
| MP3GainProgressChangedEventArgs | Contains the event data of a ProgressChanged event. |
| MP3GainStartedEventArgs | Contains the event data of a Started event. |
| MP3GainWrapper | A wrapper of MP3Gain.exe application. |
| MP3GainChannel | Specifies a stereo channel of an audio file to apply volume gain. |
| MP3GainOperation | Specifies a MP3Gain operation. |