Under LLE, the virtual chip handled this "unzipping" naturally as part of its cycle-accurate process. However, under early HLE attempts, this compression caused headaches. The emulator would receive a block of data, but without the low-level timing of the original chip, the audio could glitch, pop, or lose stereo separation.
Here is where confusion begins. stands for High-Level Emulation . qsound hle zip work
So the next time you download a Capcom ZIP file, remember: You aren't just playing a ROM. You are watching a high-level translator (HLE) read a compressed archive (ZIP) to trick your computer into thinking it’s a 90s arcade sound chip (QSound). Under LLE, the virtual chip handled this "unzipping"