I have a problem hooking up my soundblaster via toslink(Optical sound) to a 5.1 surround system. When I play back I only get 2 channels to work, even though the setting are set to 5.1 on my mac mini. I have tried to change settings in the MIDI thing, but it doesn't work. Does anyone know how to fix this problem? Is there any softwear or so that would fix it?