Xforge is a graphical wave editor for UNIX systems with X11 and Motif.
Though Xforge supports multiple wave formats, it is not a wave format converter or encoder/decoder; there exists a wonderful utility called Sox for that purpose. You will find that Xforge supports very few wave formats at the moment. Are you interested in coding decoders / encoders for your favourite file formats?
For install you just need to do the following: