This method emulates the actual hardware circuitry and the internal microprocessor of the sound chip. While highly accurate, it requires an external ROM (the chip's internal code) to run. For years, the QSound internal "DSP" code was protected and unread.
QSound was revolutionary. It created a 3D positional audio effect from only two speakers. When you played Street Fighter II on a real arcade cabinet, you could hear the "Hadouken" travel from left to right as it crossed the screen. The thunderclap of Zangief’s lariat seemed to whirl around your head. This wasn't just stereo panning; it was a psychoacoustic illusion. And it was powered by proprietary microcode—the specific program that told the DSP hardware how to process audio. qsound-hle.zip mame