[Is there a plugin that lets you automate VSTs that won't MIDI learn CC changes?]

Dear Anyone.  

OK, I'm a noob, I don't know what I'm talking about, I'm just about to prove that  (before anyone else here tells me all those things!) 

I've got a bunch of VSTs - OK, freebies and demos, I'm trying to learn without blowing the bank - which make great noises - but they're totally uncontrollable because none of them do CC changes.  So as far as I know, unless you  tell me otherwise, I can't automate 'em.  (WHY do  they make VSTs that don't do CC changes!?!) 

Anyway.  Is there such a thing as a plug-in I can use as an insert effect that DOES accept MIDI CC changes to get louder and softer, so at least I can turn the sounds up and down? Of course I can on the VSTs, but they have to stay at one level the entire time because I've got no way to change them on-the-fly.  

Anyone got any ideas? It's just annoying to have all these lovely sounds I can't really use cos I can't automate them.

Yours hopefully

Chris.