In all these, the QSound DSP is separate from the main CPU and handles all audio output.
Key point: QSound wasn’t just a simple PCM player. It used psychoacoustic HRTF-like processing to create a wide stereo field from mono sources, plus compression similar to ADPCM but with a Capcom twist. dl-1425.bin %28qsound hle%29
Disclaimer: Distributing copyrighted arcade ROMs or BIOS files is illegal. dl-1425.bin is considered intellectual property of Capcom. However, if you legally own an original CPS-2 arcade board, you have the right to dump your own BIOS. In practice, most emulation users must source this file from their legally obtained ROM sets. In all these, the QSound DSP is separate
The dl-1425.bin file likely contains data used by an emulator to provide QSound HLE audio. This could include: dl-1425
If you are writing an emulator and want to implement qsound HLE:
dl-1425.bin is still recommended to include as a “presence check” to avoid legal claims of reverse‑engineering from a clean room.