I have 8 video tracks and 4 audio track coming out of a DVR device. The device is configured to record 4 rooms with two cameras and one microphone in each. Unfortunately, the DVR does not allow me to combine each audio track with two video tracks. (How dumb is that.) Anyway, is there a video editing tool that would allow me to transfer the audio from each AVI file that does have audio to the one that doesn't?