se in C++ software. Steinberg developed the VSTGUI GUI generation package around the same time as their first plugin API named VST and implemented platform-independent GUI controls packaged in C++ objects. This software has been refined and updated to its current fourth generation state known as VSTGUI4. We will refer to it simply as VSTGUI. This GUI design software was developed with audio plugins in mind right from the beginning. It has matured into a quite remarkable open-source library of GUI objects th