Usually when one wriggles a param on a vst, the index & values are dumped out the 4th outlet of the vst object. However, occasionally there are plugins where this doesn’t work—no values or indexes are reported. Why is this? Is there a workaround?

Usually when one wriggles a param on a vst, the index & values are dumped out the 4th outlet of the vst object. However, occasionally there 

no-vst-param-index-value

Some plugins don't expose all parameters. Usually you need to setup which parameters are exposed inside the plugin.

No Vst param index & value