SoX (Sound eXchange)

SoX offers features are Reading and writing Au, WAV, AIFF, MP3 (via an external LAME MP3 encoder), Ogg Vorbis, FLAC and other audio file formats, playing via URL (internet file or stream), Editing via concatenate, trim, pad, repeat, reverse, volume, fade, splice, normalize, Processing via chorus, flanger, echo, phaser, compressor, delay, high-pass/low-pass filter, Adjustment of pitch and tempo, pitch (without tempo), tempo (without pitch), and sample rate, Noise removal using frequency profiling, Silent passage removal, Simple audio synthesis, Multi-file & multi-track mixing, Multi-file merging, spectrogram analysis, support for over 20 audio file formats (sox –h) like ogg vorbis, mp3, wav, aiff, voc, snd, au, gsm, supports ladspa plugins.