This is commercial software for the Mac which allows you to synchronize different "tracks" -- e.g., multiple transcription tracks, a video track and a comment track. The authors call a collection of these tracks a "score" and the format resembles a musical score. Video is stored in a track as a series of time-stamped frames. A user interested in a specific part of the video can put the desired frames on the score and use the other tracks to describe them. Although playing a video is allowed, it is not synchronized with the other tracks while playing. A demo version is available. A single license for an educational institution is DM 850.00.