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ZynAddSubFX is a very cool and amazingly powerful software synth.

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http://linuxlandit.blogspot.com –  ZynAddSubFX is a open source software synthesizer capable of making a countless number of instruments, from some common heard from expensive hardware to interesting sounds that you'll boost to an amazing universe of sounds. The project was started in March 2002 by Nasca Octavian Paul. He began to write ZynAddSubFX in order to create a synthesizer which could produce beautiful sounds, while being freely available to anybody who needs it. For sound generation it has three hybrid synth engines that combine additive, subtractive, Fourier and other synthesis methods. No external samples ar (HowTos)