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src/tempo/beattracking.c: normalise confidence

--- a/src/tempo/beattracking.c

+++ b/src/tempo/beattracking.c

@@ -428,7 +428,7 @@

 aubio_beattracking_get_confidence (aubio_beattracking_t * bt)

 {

   if (bt->gp) {

-    return fvec_max (bt->acfout);

+    return fvec_max (bt->acfout) / fvec_sum(bt->acfout);

   } else {

     return 0.;

   }