Show Cue System

To use SCS for our theatershow, I bought a MSI megabook 655 with onboard firewire. I use a M-Audio audiophile external audioadapter. After installation of SCS there is no sound coming out of te adapter. I tryed a firewire pmcia card, and then all worked fine. I think the problem is the firewire driver. The internal driver is ;OHCI compliant ieee 1394 host controler, the card driver is;Via OHCI compliant ieee 1394 host controler.Does someone know if you can change the driver or if there is a workaround to let the firewire conection work with SCS.
Greetings
Henry