Audacity is a free and powerful digital audio editor, which allows you to record and edit any audio files, add beautiful effect, cut, merge and more. Audacity is reliable to use as editor of variety audio formats such as mp3, wav, OOG and much more. Audacity is very rich of audio editing features, allowing you to change the tempo, changing level of bass and treable, noise reductions, reverb, change pitch and so on. In addition, it also can be used for post-processing of all audio formats, including audio mix, normalization, trimming, fading, and more.