Some links only...
http://dynabook.com/assistpc/download/winxp/readme/sound/a1x10sndx.htm https://www.google.fr/search?q=YAMAHA+DS-XG+msdos https://www.google.fr/search?q=ymf+754b+msdos http://www.yamaha.co.jp/english/product/lsi/download/
So this is for later. Maybe...