Install libopenmpt-doc by entering the following commands in the terminal:
sudo apt update sudo apt install libopenmpt-doc
module music library based on OpenMPT -- documentation
libopenmpt is a cross-platform C++ and C library to decode tracked music files (modules) into a raw PCM audio stream. It is based on the player code of the OpenMPT project, a descendant of the original ModPlug Tracker. . This package contains documentation for developing programs which use libopenmpt.