Not long before MIDI more or less died, Yamaha created a software synthesiser probably primarily to support making cheaper sound chips like the YMF-724 using some of the same technology. They sold some commercial versions of this however which add a new MIDI device to the Windows MIDI list. This software synthesiser uses very little actual CPU power since MIDI synthesis really required very little power relatively speaking by the time they came up with this. Because it provides the XG synthesis, it is of a much higher quality than many other MIDI synthesisers. This is useful for old games, especially for people with sound devices that attempt to cheapen things by putting basically no MIDI synthesis on the card itself and use either the crappy Microsoft Roland ripoff software synthesis, or worse, a few even only have the OPL FM synthesis. Unfortunately, this synthesiser will not work in DOS, however, it will work in DOS games when played through Windows NTVDM/VDMSound or DOSBox.