Filtering a parameter

There’s no hidden list that I know.
You can use parameter list or zone editor.

Modulation sources and destinations are listed here:
[u]https://developer.steinberg.help/display/HSD/Modulation+Source+Types[/u]

I find that very helpful if you want to limit modulation matrix options to those relevant to your instrument.


Edit:

You can print them if you want to.

element=this.parent:getZone()
parameter="Filter.ShapeA"
parameterDef=element:getParameterDefinition(parameter)

if parameterDef.type=="integer" then do
  for i=parameterDef.min, parameterDef.max do
    local displayString=parameterDef:getDisplayString(i)
    print("{name= \""..displayString.."\",          index= "..i.."},")
    end
  end
else
  print("Parameter is not integer")
end