The docs in the Amiga version of Frotz (a popular interpreter of infocom's z-machine format games) have a section about sound wich deals specifically with Lurking Horror pointing to some aditional files avalaible at the if-archive. I can't check it out as I'm at job right now, but it might provide useful info.
AmigaFrotz at Aminet:
hereAmigaFrotz at the if-archive:
here
