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examples/: set threshold as needed

--- a/examples/aubionotes.c

+++ b/examples/aubionotes.c

@@ -147,6 +147,7 @@

   o = new_aubio_onset (onset_mode, buffer_size, overlap_size, channels,

           samplerate);

+  if (threshold != 0.) aubio_onset_set_threshold (o, threshold);

   onset = new_fvec (1, channels);

   pitchdet = new_aubio_pitch (pitch_mode, buffer_size * 4,

--- a/examples/aubioonset.c

+++ b/examples/aubioonset.c

@@ -78,6 +78,7 @@

   o = new_aubio_onset (onset_mode, buffer_size, overlap_size, channels,

           samplerate);

+  if (threshold != 0.) aubio_onset_set_threshold (o, threshold);

   onset = new_fvec (1, channels);

   examples_common_process(aubio_process,process_print);

--- a/examples/aubiotrack.c

+++ b/examples/aubiotrack.c

@@ -83,6 +83,7 @@

   tempo_out = new_fvec(2,channels);

   bt = new_aubio_tempo(onset_mode,buffer_size,overlap_size,channels, samplerate);

+  if (threshold != 0.) aubio_tempo_set_threshold (bt, threshold);

   examples_common_process(aubio_process,process_print);

--- a/examples/utils.c

+++ b/examples/utils.c

@@ -56,7 +56,7 @@

 /* energy,specdiff,hfc,complexdomain,phase */

 char_t * onset_mode = "default";

-smpl_t threshold = 0.3;

+smpl_t threshold = 0.0;         // leave unset, only set as asked 

 smpl_t silence = -90.;

 uint_t buffer_size = 512;       //1024;

 uint_t overlap_size = 256;      //512;

@@ -148,17 +148,11 @@

       case 'O':                /*onset type */

         onset_mode = optarg;

         break;

-      case 's':                /* threshold value for onset */

+      case 's':                /* silence value for onset */

         silence = (smpl_t) atof (optarg);

         break;

       case 't':                /* threshold value for onset */

         threshold = (smpl_t) atof (optarg);

-        /*

-           if (!isfinite(threshold)) {

-           debug("could not get threshold.\n");

-           abort();

-           }

-         */

         break;

       case 'p':

         pitch_mode = optarg;