You might have found it there, but normally you check what's in the repos with apt or Synaptic (Package manager)newer version in the repository and it was recommended to install that. I opened the software portal and searched
I think the correct name is Mp3splt which may explain that you can't start it from the command line
http://mp3splt.sourceforge.net/mp3splt_ ... n/man.html
If you have to specify a path for it I guess /usr/bin/Mp3splt
