void play_sample(uint8_t * s, uint16_t l, bool r);
void play_note(double freq, int vol);
void stop_note(double freq);
-void stop_all_notes();
-void init_notes();
+void stop_all_notes(void);
+void init_notes(void);
void play_notes(float (*np)[][2], uint8_t n_length, bool n_repeat);
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