The method for specifying music tracks has been replaced with much simpler code. When opening a project from a previous version of MatrixSlide, the existing music track information will be automatically converted to the new scheme.
If background music is used, a "music" icon is displayed, rather than displaying the audio control bar at all times. Clicking the icon reveals or hides the audio control bar. The margin applied to the icon can be adjusted so that if you want the icon in the same top or bottom location as other page elements (title bar, thumbstrip, controls, etc.), the icon can be kept clear of them.
Modified handling of caption buttons with empty text or tooltips.