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Pazera Free MP4 to MP3 Converter is a free program that converts MP4, M4A (iTunes audio files), M4B (audiobooks), M4R (ringtones) and AAC files to MP3 or WAV format. In addition, the program lets you copy (extract) original audio tracks without any loss of quality. The program also allows you to split files based on chapters stored in input files (often found in M4B files). Metadata by default are copied from the source files, but the user can add their own tags. To convert audio streams to MP3 the application uses the latest version of the LAME encoder. The program supports encoding with a constant bit rate - CBR, average bitrate - ABR and variable bit rate - VBR (based on LAME presets). Basic operation of the application is very simple: just drag & drop MP4, M4A, M4B or AAC files into main window and click CONVERT button. At default settings, the application converts files to MP3 with constant bitrate (CBR) and automatically selects all the encoding parameters so as to preserve the original audio quality and get the smallest MP3 files. More advanced users can customize many encoding parameters: audio bitrate, bitrate mode, number of audio channels, audio sampling frequency, volume, time range and other.