Are you sure? That is the case with SimMan, but VitalSim doesn't support sound files unless they are ported through the control box audio input.
That said, you could hook up a microphone to the VitalSim Control Unit (not the handset, but the part that plugs into the manikin). and talk through the VitalSim there. I believe a wireless mic can also be hooked up to the control unit and you can interact with the student nurses from across the room.
If I'm wrong about the wav file, someone please tell me.
Michael Young