Audacity allows you to record sounds, play sounds, import and export WAV, AIFF, and MP3 files, and more.Built-in effects include Bass Boost, Wahwah, and Noise Removal, and it also supports VST plug-in effects.Use it to edit your sounds using Cut, Copy and Paste (with unlimited Undo), mix tracks together, or apply effects to your recordings. It also has a built-in amplitude envelope editor, a customizable spectrogram mode and a frequency analysis window for audio analysis applications.Requirements:

Ссылка: http://audacity../files/audacity-macosx-ub-1.3.9.dmg