Wavosaur is a free audio editor with VST support and many features for editing
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A utility to split mp3 and ogg files selecting a begin and an end time position.
Making beats, sequencing with your favorite instruments, or multitrack recording
Audacity - Edit your digital audio files
Free Audio Dub: edit audio files fast & lossless, free audio editing softwar
Mutabor is a program that supports the live music with micro tones.