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examples/aubiopitch.c: use built-in silence

--- a/examples/aubiopitch.c

+++ b/examples/aubiopitch.c

@@ -63,8 +63,12 @@

   verbmsg ("tolerance: %f\n", pitch_tolerance);

   o = new_aubio_pitch (pitch_method, buffer_size, hop_size, samplerate);

-  if (pitch_tolerance != 0.) aubio_pitch_set_tolerance (o, pitch_tolerance);

-  if (pitch_unit != NULL) aubio_pitch_set_unit (o, pitch_unit);

+  if (pitch_tolerance != 0.)

+    aubio_pitch_set_tolerance (o, pitch_tolerance);

+  if (silence_threshold != -90.)

+    aubio_pitch_set_silence (o, silence_threshold);

+  if (pitch_unit != NULL)

+    aubio_pitch_set_unit (o, pitch_unit);

   pitch = new_fvec (1);

   wavetable = new_aubio_wavetable (samplerate, hop_size);

-- 

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