An open source kernel extension enabling native macOS HD audio for not officially supported codecs without any filesystem modifications. AppleALCU can be used for systems with digital-only audio.
To support more audio codecs in the binary packages you are asked to submit your configurations. Please read the wiki for more details. For the contributors with programming skills the headers are filled with AppleDOC comments.
Writing and supporting code is fun but it takes time. If you want to thank the author for his work consider contributing, bugreporting, or providing the support to other users.