I have renamed the opcodes in vst4cs as follows for greater intelligibility:

vstinit -- Loads a plugin
vstaudio, vstaudiog -- Returns a plugin's output
vstmidiout -- Sends MIDI data to a plugin
vstparamset, vstparamget -- Send automation data to and from the plugin
vstnote -- Sends a MIDI note with definite duration
vstinfo -- Outputs the Parameter and Program names for a plugin
vstbankload-- Loads an .fxb Bank
vstprogset-- Sets a Program in an .fxb Bank.
vstedit -- Opens the GUI editor for the plugin, when available.

The behavior of the opcodes has not changed.

I changed the example vstcsound.csd example file to suit.