When you successfully integrate dl-1425.bin into qsound-hle.zip and hear that rich, wide stereo for the first time, you are not just fixing an error. You are resurrecting a piece of engineering that thousands of people experienced in noisy arcades during the 1990s.
Without this file, the emulator’s CPU is trying to talk to a phantom chip. It knows a coprocessor should be there to decompress and spatialize the audio streams, but the instructions are missing. The result is that infinite loop of silence. dl-1425.bin qsound-hle.zip