title: set tempofatcor for MIDI
body: <p>I couldn't make the MIDI player take effect with new value other than 1.0, what wrong with the code? No error was shown on the console.</p>
  
  <pre><code>vaTempo = Pattern.compile("tempo").matcher(f).replaceFirst("");
              float ff = Float.valueOf(vaTempo.trim()).floatValue();
              if (sequencer != null &amp;&amp; sequencer.isOpen()) {
                  System.out.println("TemopoChange: "+ff);
                  sequencer.setTempoFactor(ff);
              }
  </code></pre>