code: public static PCM loadPCM(String filename) throws IOException {
  
          PCMContainer pcmContainer = loadPCMContainer(filename);
          // Get the PCM
          PCM pcm = pcmContainer.getPcm();
  
          return pcm ;
      }
docs: A helper method to get a PCM (share the limitation of _loadPCMContainter)
  @param filename
  @return
  @throws IOException