Previously, emulators used a file named qsound.bin . However, around MAME version 0.185/0.201 , the emulation of this hardware was updated to be more accurate, requiring the newer dl-1425.bin instead.
In summary, while dl-1425.bin is the raw, original firmware required for cycle-accurate audio replication, qsound-hle.zip represents the modern effort to simulate that audio via software, balancing performance and accuracy while bypassing the need for the copyrighted BIOS. dl-1425.bin qsound-hle.zip
A correct version of this file typically has a CRC32 hash of d6cf5ef5 . Understanding qsound-hle.zip Previously, emulators used a file named qsound