mhWaveEdit is a graphical program for editing, playing and recording
sound files. It is lightweight, portable, user-friendly and handles
large files very well. 

The program itself has only simple editing features such as
cut'n'paste and volume adjustment but it can also use Ladspa effect
plugins and the effects provided by the SoX application. It can also
support additional file formats besides wav through libsndfile and
mp3/ogg import and export through lame and oggenc/oggdec. 

The program will use libsndfile, libsamplerate, and lame (all of them
are available at SlackBuilds.org) if installed, but they are not
mandatory.