Libraries are built as VST Sound container files that contain all the components that make up your instrument, such as presets, samples, macro pages, MIDI modules, scripts, and sub presets.

When working with HALion, all presets are managed by the MediaBay. Often, presets refer to other files, such as samples, macro pages, and Lua scripts. Combining presets with all the referenced files into a library makes it easy to distribute them and to protect them against being modified or deleted.