- dumps core when there are non-functional blocks (i.e. missing input
  connection) in a network and trying to simulate
- sndlib seems to have problems writing and reading AIFF files.
- execution may slow down exponentially with some parameter values
  (e.g. chorus-flanger)
- should exit gracefully?:
    717. [jams@kalalokki] /share/arg/sf/src/examples %./noise-test
    Network: "noise-test" (2 block(s), 1 wire(s))
     Noise generator: "z" (1 input, 1 output terminal(s))
      Input "amp" (44100 Hz): No connections (default value)
      Output "y" (44100 Hz): "x@b"
     File output: "b" (1 input, 0 output terminal(s))
      Input "x" (44100 Hz): 1 connection(s)
    kerkko.wav: Permission denied
    write called on closed filezsh: 15560 floating point exception  ./noise-test
- This works:       ./chorus-flanger 5 helmi.wav cflexample.wav 1.1 0 0 0.8 0 1
  But this doesn't: ./chorus-flanger 5 helmi.wav cflexample.wav 1   0 0 0.8 0 1  
- DFS might end up with a confused internal state if an exception occurs during
  its execution
