Just wanted to let everyone in on this little tidbit if there's anyone out there trying to play this on a Mac through Boxer, since I had considerable trouble finding just what had to be done to get Yserbius to work with sound and music. Firstly, Boxer has MT-32 support built in. Just look in the program's preferences and under the Audio tab. As indicated by Boxer, you'll need to find the two ROMs that will complete the MT-32 emulation. Once you have found those (and they are fairly easy to find), just drop them onto the open audio preferences. The only other thing you'll have to do is described above by slohand. Using a text editor that allows you to save files with filetypes other than the oft-required .txt or .rtf (such as Sublime Text 2, rather than TextEdit or Pages etc.), create a file called LSCI.CFG and add the line "music = SNDBLAST.DRV 220" to the body of the document (no quotes). Save it wherever. Then, find your Boxer copy of Yserbius. Right click it to "show package contents." Paste the LSCI.CFG file into the "C.harddisk" folder. Lastly, open up Boxer, open up Yserbius and enjoy it in all its glory!