text: #pragma once
  
  #include <stdbool.h>
  
  // Initializes the audio board.
  void audio_board_init();
  
  // Returns true if the audio board has started successfully.
  bool audio_board_has_started();
  
  // Returns true if the audio board is playing a file.
  bool audio_board_is_playing();
  
  // Plays the dial tone, returns true if playing successfully.
  bool audio_board_play_dial_tone();
  
  // Plays the busy tone, returns true if playing successfully.
  bool audio_board_play_busy_tone();
  
  // Plays an OGG file by name, returns true if playing successfully.
  // The file name must be null-terminated.
  bool audio_board_play_file(const char* file_name);
  
  // Stops playback, returns true on success.
  bool audio_board_stop_playback();
  