As far as I can tell (unless I am doing something wrong) my Audio (Uncompressed WAV) and Video (Indeo 5.11 with a keyframe every 1 frame) (encoded as seperate files) do not scratch properly in Avenue. The Video scratches back and forth fine (without Audio) and so does the Audio (without Video), but when combined and you reverse the speed so they are playing backwards, the video jumps to another point, putting them out of sync. It only syncs up again (by jumping) when you play them forward again.
I'm going to try with PIC video Mjpeg to see if the problem persists, but has anyone had this problem?