Sound questions

I would like to make a video while in FS9 and be ableto record the ATC sound while flying in Vatsim.I've got the video side working fine but I'm a bit loston how to record. My set-up is as follows:3 PC LAN via Router and cablePC1 - Main FS9 InstallationSounds via motherboard built-in Creative 24bit soundcard to connected speakers.PC2 -WideFSFSInn Vatsim ClientExtigy USB Soundcard Plantronics Headset USBSpeakers connected to line out on ExtigyVatsim voice activated by pressing button on yoke.Push-to-talk also configured in FSUIPC and in FSInn.All works very well except I haven't got a clue how to getthe voice I hear on my headset/speakers on PC2 to recordon video being made on PC1.Any advice would be greatly appreciated. Thanks in advance.