What exactly is this for?
Im not sure that there is any software that can do what you are looking for.
If possible you should take the video and audio in separetly and then edit them together afterwards. For this you might need to record your audio onto some other format first.
The only other way is to capture in analogue and take video out the camera into the capture device and the audio out of your roland unit into the capture device.
Why do you want to do this anyway?
Full Specs: 3.2 Pentium 4 Processor, 1Gb RAM 80Gb Root Drive, 120Gb Video Drive + another 160Gb external, Adobe Premiere Pro, Pinnacle liquid edition pro, ati radion 256mb