int prognum);
void fluid_synth_sfont_unref(fluid_synth_t *synth, fluid_sfont_t *sfont);
-void fluid_synth_dither_s16(int *dither_index, int len, float *lin, float *rin,
+void fluid_synth_dither_s16(int *dither_index, int len, const float *lin, const float *rin,
void *lout, int loff, int lincr,
void *rout, int roff, int rincr);