set tempofatcor for MIDI
<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>
