The driver is software designed to enable and enhance the functionality of Crystal Semiconductor (or Cirrus Logic) sound cards on Windows-based computers. The "WDM" in the name stands for Windows Driver Model, which refers to a driver model used by Microsoft for handling audio and other multimedia devices on Windows operating systems. The SoundFusion driver allows the computer to communicate with the sound hardware, ensuring proper audio playback, recording, and functionality of features like surround sound or 3D audio.

Crystal SoundFusion is a family of integrated sound solutions that were used in many older PCs, particularly around the late 1990s and early 2000s. These drivers are often associated with older motherboards or add-on sound cards that use Crystal or Cirrus Logic audio chips.