The online documentation can be found here:
https://developer.steinberg.help/display/SDH/Steinberg+Developer+Resource
You can read the parameter names in Parameter List. Some of them are organised in folders. In that case you address them by “Folder.parameter” (for example “Filter.Cutoff”, “Filter.Resonance”). Otherwise just use the parameter name as it appears in Parameter List. Special category are modulation matrix parameters. First you need to address the modulation matrix row by getModulationMatrixRow ()