Over the previous release, Beta 2 features bug fixes and other minor improvements, as well as some visual refreshes (including a new color scheme and a flatter, more consistent appearance) and other bug fixes for the new default theme. Speaking of themes, by far the most significant, user-visible change on 5.1 is a new default theme known as Lambda, which features a brighter appearance and a cleaner interface. StepMania 5.1 focuses primarily on internal enhancements, especially for content creators (including but not limited to controller support improvements, support for custom songs in profiles on USB drives, fullscreen improvements on X11, a large number of new modifier effects, and a new image caching system), while preserving compatibility with StepMania 5.0.x content such as themes and noteskins. The StepMania project is proud to announce the release of StepMania 5.1 Beta 2 this is the second publicly-released beta build based on the '5_1-new' branch (see roadmap update for details).