If the game requires a "Sound Blaster or compatible" card, maybe the Crystal isn't compatible enough? Sometimes cards have setup options or command line switches for native or SB compatible modes.
"When I nod my head, hit it with the hammer."
(Moe, holding nail, to Curly, holding hammer)
"I am not able to rightly apprehend the kind of confusion of ideas that could provoke such a question."
-- Charles Babbage, mathematician, computer pioneer, analytical engine designer (1791-1871)
-- (Question: 'Pray, Mr. Babbage, if you put into the machine wrong figures, will the right answers come out?')
"Just because I don't care, doesn't mean I don't understand."
-- Homer Simpson