1 - Introduction to FM synthesis
⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀ ⣀⣀⣀ ⠀⠀⠀⠀⠀⠀⠀⠀⣀⣠⣀⠀⠀⠀⠀⠀⠀⠀⠀⠀⣴⣶⣶⣄⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⢠⣾⣿⣷⡄⠀⠀⠀⠀ ⢘⠛⣿⢛⡆ ⠀⠀⠀⠀⠀⠀⠀⢸⡛⣿⣛⡃⠀⠀⠀⠀⠀⠀⠀⠀⣦⣽⣧⡴⠀⠴⣿⣿⢶⠀⠀⠀⠀⠀⠀⠀⠀⠰⣶⣿⣶⠃⣀⣤⣄⡀⠈⢿⣿⡟⠁ ⠀⠀⠀⠀⠀⠀⠀⠈⠻⣿⡿⠁⠀⠀⠀⠀⠀⠀⠀⠀⢈⣻⣟⡁⠀⢲⣶⣷⡾⠀ ⠀⠀⠀⠀⠀⠀⠀⢀⣨⣿⣅⡀⣛⣻⣛⡃⣠⣶⣿⣶⣄ ⠀⠀⠀⠀⠀⠀⠀⣠⣶⣿⣶⣦⠀⠀⠀⠀⠀⠀⠀⣰⣿⣿⣿⣿⡄⣀⣹⣯⣀⠀⠀⠀⠀⠀⠀⠀⢀⡿⣿⣿⣿⢷⠹⣿⡿⢡⡟⣿⣿⣿⢻⡄ ⠀⠀⠀⠀⠀⠀⢠⡟⣿⣿⣿⢹⡆⠀⠀⠀⠀⠀⠀⡿⢸⣿⣿⡇⣿⢿⣿⣿⡿⣇⠀⠀⠀⠀⠀⠀⢸⡇⣿⣿⣿⢸⣷⣿⣷⣾⢃⣿⣿⣿⠸⡇ ⠀⠀⠀⠀⠀⠀⢸⠇⣿⡿⣿⡘⡇⠀⠀⠀⠀⠀⠀⡇⣾⠟⢻⡇⣿⢸⣿⣿⡇⢻⠀⠀⠀⠀⠀⠀⢸⢰⡿⠉⣿⣿⣿⣿⣿⣹⣾⡏⠀⣿⡠⡇ ⠀⠀⠀⠀⠀⠀⢸⠤⡿⠀⢹⡧⣇⠀⠀⠀⠀⠀⠰⡃⣿⠀⠘⡗⣻⢼⡏⠙⣷⢸⠀⠀⠀⠀⠀⠀⠺⢹⡇⠀⢹⡯⣿⡿⣿⡏⣿⡇⠀⢸⠀⠁ ⠀⠀⠀⠀⠀⠀⠈⢀⡇⠀⢸⡇⠁⠀⠀⠀⠀⠀⠀⠀⣿⠀⠀⡷⠋⢸⠁⠀⣿⠨⠂⠀⠀⠀⠀⠀⠀⢸⡇⠀⢸⠆⣿⠀⢸⡇⢾⡇⠀⢸⠃ ⠀⠀⠀⠀⠀⠀⠀⠘⡇⠀⢸⡇⠀⠀⠀⠀⠀⠀⠀⠀⣋⠀⠀⡇⠀⢸⠀⠀⣿⠀⠀⠀⠀⠀⠀⠀⠀⢈⡇⠀⢸⡁⡿⠀⠸⣇⡼⠃⠀⠸⢤ ⠀⠀⠀⠀⠀⠀⠀⠴⠃⠀⠘⠦⠀⠀⠀⠀⠀⠀⠀⠚⠁⠀⠀⠉⠂⣸⠀⠀⣌⠀⠀⠀⠀⠀⠀⠀⠈⠉⠀⠀⠀⠉⡇⠀⠀⡇ ⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠈⠁⠀⠀⠀⠉⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠤⠃⠀⠀⠣⠄