The Sound Blaster Pro Compatible sound chip is integrated into the VIA
PCI audio device in order to have Sound Blaster compatible DOS games
running on the system.
If you want to play those Sound Blaster compatible DOS games under the
real mode MS-DOS or the "Restart in MS-DOS" from Win9x. Then you should
run this setup program to enable the OPL3 MIDI music. Otherwise, the
music will not be heard but the sound still could be heard.