+/* ao_beep.c */
+
+#define AO_BEEP_LOW 150
+#define AO_BEEP_MID 94
+#define AO_BEEP_HIGH 75
+#define AO_BEEP_OFF 0
+
+void
+ao_beep_init(void);
+
+void
+ao_beep(uint8_t beep);
+
+void
+ao_beep_for(uint8_t beep, uint16_t ticks);
+
+/* ao_led.c */
+
+#define AO_LED_NONE 0
+#define AO_LED_GREEN 1
+#define AO_LED_RED 2
+
+void
+ao_led_init(void);
+
+void
+ao_led_on(uint8_t colors);
+
+void
+ao_led_off(uint8_t colors);
+
+void
+ao_led_set(uint8_t colors);
+
+void
+ao_led_for(uint8_t colors, uint16_t ticks);
+