wxMP3gain is a free front-end for MP3gain designed for adjusting the gain of MP3 tracks easily.

wxMP3gain analyzes and adjusts your MP3 files so that they have the same volume. Any changes wxMP3gain makes will be completely lossless; this is because it adjusts the MP3 file directly, without the need for decoding and re-encoding.

Once set up, wxMP3gain can rapidly analyze files for various data like current volume, clipping, gain as well as tag information. The interface is easy-to-navigate and permits you to add tracks either by drag n' drop, tree view or standard selection.

You also have the option to set wxMP3gain to lower the gain automatically - this can prevent audio clipping, and utilize APEv2 or ID3v2 tags. It also allows overwriting of existing files.