: You need to find qsound_hle.zip from a reputable ROM site or a full MAME ROM set collection (such as those hosted on Archive.org ).
If MAME cannot find the QSound device file in your directory, it will throw a missing files error (e.g., "qsound.bin NOT FOUND" ) and refuse to boot the game, or it will boot the game with completely muted audio.
This was a high-end positional 3D audio technology developed by QSound Labs. It was widely used in Capcom’s CPS-2 (Capcom Play System 2) hardware for legendary games like Street Fighter Alpha , Darkstalkers , and Marvel vs. Capcom .
As MAME advanced toward absolute historical accuracy, developers successfully mapped out a path for the QSound chip. LLE emulates the chip's internal components directly. However, because LLE requires significantly more CPU power and HLE is highly optimized, MAME natively relies on High-Level Emulation for standard gameplay to avoid audio stuttering.