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src/effects/timestretch_rubberband.c: invert stretch ratio

--- a/src/effects/timestretch_rubberband.c

+++ b/src/effects/timestretch_rubberband.c

@@ -31,7 +31,7 @@

 #include "rubberband/rubberband-c.h"

 #define MIN_STRETCH_RATIO 0.025

-#define MAX_STRETCH_RATIO 10.

+#define MAX_STRETCH_RATIO 40.

 /** generic time stretching structure */

 struct _aubio_timestretch_t

@@ -133,7 +133,7 @@

 {

   if (stretch >= MIN_STRETCH_RATIO && stretch <= MAX_STRETCH_RATIO) {

     p->stretchratio = stretch;

-    rubberband_set_time_ratio(p->rb, p->stretchratio);

+    rubberband_set_time_ratio(p->rb, 1./p->stretchratio);

     return AUBIO_OK;

   } else {

     AUBIO_ERR("timestretch: could not set stretch ratio to %.2f\n", stretch);