extern void del_aubio_filter(aubio_filter_t * b);
extern aubio_filter_t * new_aubio_filter_a_weighting (uint_t samplerate, uint_t channels);
-extern void aubio_filter_set_a_weighting (aubio_filter_t * b);
+extern uint_t aubio_filter_set_a_weighting (aubio_filter_t * b);
extern aubio_filter_t * new_aubio_filter_c_weighting (uint_t samplerate, uint_t channels);
-extern void aubio_filter_set_c_weighting (aubio_filter_t * b);
+extern uint_t aubio_filter_set_c_weighting (aubio_filter_t * b);
/* biquad */
extern aubio_biquad_t * new_aubio_biquad(lsmp_t b1, lsmp_t b2, lsmp_t b3, lsmp_t a2, lsmp_t a3);