SelectOutput doesn't have any effect

I have modified a sketch which records sound and saves it on harddrive. In the setup-function, i call the selectOutput function. When i run the sketch, i can choose an output-file, but the data get saved in the default-output-file, which i have specified above the setup-function. Why does selectOutput have no effect on the output-file?

Here is the complete code:

 import ddf.minim.*;

    Minim minim;
    AudioInput in;
    AudioRecorder recorder;
    String absoluterPfad = "/home/karl-alfred/Schreibtisch/myrecording.wav";

    void setup()
    {
      size(512, 200, P3D);

      minim = new Minim(this);

      in = minim.getLineIn();
      // create a recorder that will record from the input to the filename specified
      // the file will be located in the sketch's root folder.
      selectOutput("Select a file to process:", "fileSelected");
      recorder = minim.createRecorder(in, absoluterPfad);
      textFont(createFont("Arial", 12));
    }

     void fileSelected(File selection) {
      if (selection == null) {
        println("Window was closed or the user hit cancel.");
      } else {
        println("User selected " + selection.getAbsolutePath());
       absoluterPfad = selection.getAbsolutePath();
       println ("Absoluter Pfad: " + absoluterPfad);
      }
    }


    void draw()
    {
      background(0);
      stroke(255);
      // draw the waveforms
      // the values returned by left.get() and right.get() will be between -1 and 1,
      // so we need to scale them up to see the waveform
      for(int i = 0; i < in.bufferSize() - 1; i++)
      {
        line(i, 50 + in.left.get(i)*50, i+1, 50 + in.left.get(i+1)*50);
        line(i, 150 + in.right.get(i)*50, i+1, 150 + in.right.get(i+1)*50);
      }

      if ( recorder.isRecording() )
      {
        text("Currently recording...", 5, 15);
      }
      else
      {
        text("Not recording.", 5, 15);
      }
    }

    void keyReleased()
    {
      if ( key == 'r' )
      {
        // to indicate that you want to start or stop capturing audio data, you must call
        // beginRecord() and endRecord() on the AudioRecorder object. You can start and stop
        // as many times as you like, the audio data will be appended to the end of whatever
        // has been recorded so far.
        if ( recorder.isRecording() )
        {
          recorder.endRecord();
        }
        else
        {
          recorder.beginRecord();
        }
      }
      if ( key == 's' )
      {
        // we've filled the file out buffer,
        // now write it to the file we specified in createRecorder
        // the method returns the recorded audio as an AudioRecording,
        // see the example  AudioRecorder >> RecordAndPlayback for more about that
        recorder.save();
        println("Done saving.");
      }
    }