megadork

Hi I have a GV-2008, and the GV-NET/IO 3.1 card. I want to setup a system that would take an input trigger and record all 8 video channels for 1 min before and 1 min after that trigger time. After playing with the pre-packaged software (v8.2), I have come to the conclusion that you can only do pre-trigger recording with motion-detection triggering, and not with external triggering. Is this correct? Or is there any way to pre-trigger record off an external trigger? thx much...