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examples/aubiotrack.c: synth only when need be

--- a/examples/aubiotrack.c

+++ b/examples/aubiotrack.c

@@ -35,6 +35,7 @@

   is_beat = fvec_get_sample (tempo_out, 0);

   if (silence_threshold != -90.)

     is_silence = aubio_silence_detection(ibuf, silence_threshold);

+  if ( !usejack && ! sink_uri ) return;

   fvec_zeros (obuf);

   if ( is_beat && !is_silence ) {

     aubio_wavetable_play ( wavetable );