Go to Control Panel -> Manage audio devices -> Click the default playback sound device -> Properties -> Advanced -> Check both box under "Exclusive Mode"
A heads up, it will stop audio from everything else (hence exclusive mode) and then blast the volume at max regardless what is setup in windows and in the game test mode. Do turn the volume down first before launching the game. I can't seem to change the volume regardless of setting made in-game test mode or spice64 config. Any solution would be great