The pluginconstants.h and pluginobjects.cpp files contain many helper functions and some useful C++ objects too: CBiQuad, CWaveData, CEnvelopeDetector, etc... Because these files are periodically updated with new versions of RackAFX, you should never alter the objects contained in them. If you need to modify these objects, subclass them instead. This is really easy in Visual Studio. To subclass CBiQuad, for example:

1) in the Solution Explorer, right click on the project and choose Add -> Class

2) from the dialog, select Visual C++ -> C++ Class

3) name your derived class, and type in the Base Class name (CBiQuad here); if you plan on subclassing this object, you probably want to make your destructor virtual:

4) this will create the .h and .cpp files for you, and will #include the proper base class; you only need to add your modifications/variables/functions to complete the subclass.

- Will