Videomach has a "Link Audio Video" feature that is supposed to automatically make your audio & video file last the same length of time. I can never use it, though, because it never allows me to check the box that makes it work. Here is what I've tried: I input a file into "input video file". (I've tried all sorts of different formats of video files). Then I input an audio file (MP3) into "input audio file". I go to file>in/out points, where I am able to set in & out points for each file individually, but it never lets me link them with the "link" feature that is sitting there dead. Any advice, anyone? (I'm using Videomach 2.7.2)