At the moment, there is not a lot of runtime generator-specific documentation. Many of the generators are derived from LADSPA Integration, for which the documentation that comes with the plugins (if any) should be consulted. A look at the "Author" field in the generator's help file might point you on where to go.
Since the interface language for soundscrape is the same as its implementation language, looking at the program's source is a good way to get more information on how it operates as well.
Finally, don't hesitate to consult the references, especially for language-related issues.