Visit our main Sourceforge site to download and install the testbed database server for yourself.
If you are interested in porting the Digitial Domeworks software to TCL/TK, (currently in VB), then the downloads directory is browseable. Starting in the TCL language is a good place to find out how to use TCL with Audela, along with Building your own interface(1) and (2).
This open source software comes courtesy of Technical Innovations. Check their main download site for the latest version of this software.
The links section has more open source links to others' efforts to port this software.