  For more than the past twenty years, Csound has been one of the leaders in
the world of the computer music research, implementing innovative synthesis
methods and making them available beyond the academic environments from which
they often arise, and into the hands of musicians and sound designers
throughout the world. In its present state, Csound offers an efficient
environment for sound experimentation, allowing the user to work with almost
any known sound synthesis or signal processing method through its vast
collection of ready-made opcodes. But despite all this potential, the shared
resource of Csound instruments still lacks quality reproductions of well-known
synthesizers; even with its ability to generate commercial standard user
interfaces and with the possibility to compile Csound instruments in such as
fashion so that they can be used with no knowledge of Csound code. To fill this
gap, the authors have implemented two commercial-style synthesizers as VST
plug-ins using the Csound front-end "Cabbage". This paper describes their
architecture and some of the Csound specific challenges involved in the
development of fully featured synthesizers.
