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1. Audacity: Audacity is probably the most widely used and free audio recording software programs, capturing the hearts of both sound engineers and casual audio mixing crowd. It can be used for audio recording from microphone, file conversion, cutting, copying and editing sound files. Its supported audio file formats include MP3, WAV, AIFF and OGG Vorbis. The Beta 1.3.13 is its latest version, that is now appropriate for windows 7, Windows Vista and Mac OS X 10.6.