Multimedia authoring tools

An apparatus and method of producing multiple panels for display on a single display device receives first and second data through a user interface. The first data relates to a first panel having first visual indicia and a first timeline, while, in a similar manner, the second data relates to a second panel having second visual indicia and a second timeline. The apparatus and method select a given time in both the first and second timelines, and coordinate, at least in part in a computer process, the first data with the second data to produce a multi-panel presentation. The multi-panel presentation has at least one instruction that causes at least a portion of at least one of the first panel and second panel to change size at the given time when displayed on a single display device.