t@b ZS4 is a multi-track video compositing/editing system with more than 120 built-in video effects including excellent color and chroma keying tools, distortion effects, color adjusters, pattern generating effects and many others. Effect containers can be used to restrict the processing of contained video effects by shape or blending logic. Other features include custom video export size, number of tracks and sub-composites limited only by available memory, custom speed and direction change for video and audio, optional super-sampled compositing during export for better quality rotation and zoom, and the ability to slave effect and compositing controls to audio wave forms. Input is primarily avi, wav, and image files. Output includes avi, wav, jpg, png, bmp. ZS4 is free for personal use. Visit http://www.zs4.net.