That's one of the drawbacks of using separate video and audio capture devices. Try changing the settings in the audio capture to a much lower rate, it might be currently set at 48Khz or 48000Hz, which is more than adequate for most users. Try reducing it 32Khz or even 22Khz, also try reducing the bit rate from 16bit to 12bit or even 8bit, the quality will certainly be affected with those settings. Alternatively connect up your analogue 8MM camcorder to your digital camcorder using the AV cables and then run a Firewire from your digital camcorder to the Firewire socket on your computer. What you have created is an analogue to digital convertor by placing your digital camcorder in the loop.