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Fixed #62 midi output missing in aubiotrack.

--- a/examples/aubiotrack.c

+++ b/examples/aubiotrack.c

@@ -40,6 +40,18 @@

   fvec_zeros (obuf);

   if ( is_beat && !is_silence ) {

     aubio_wavetable_play ( wavetable );

+    /* Send tap over midi output */

+    /* Is called without jack use so ask for jack use */

+    if (usejack)

+    {

+       /* Note on midi clock: Midi clock looks like it is more suitable here,

+       * but it is send 24 times between the detected bpm which is impossible

+       * to do since we get here only once per peat.

+       * Therefore midinote is used as a good workaround.

+       * Reference:

+       * http://www.blitter.com/~russtopia/MIDI/~jglatt/tech/midispec/clock.htm */

+      send_noteon(0, 0);

+    }

   } else {

     aubio_wavetable_stop ( wavetable );

   }