The variator is the key to the fast changing! ... it's random ... the variator puts a limit on the parameters of that randomness, so pulling it back will solve that prob.
I realise when testing, a low setting on the variator gives the impression that nothing significant is happening, but randomness can have that sneaky habit of seeming to do nothing til it pops a loud one in followed by a quiet one when you are at the point of giving up on it!
... and then it can piss you off by throwing 6 quiet ones in a row ... then two or three loud ones just as you increase the volume! 
I think what you might be looking for, as a happy medium between random and controllable, is a step sequencer thrown in. I can do that easily. You could then have a host synced volume change pattern, combined with the variable random element .... is that the ticket?
I could prob sync an LFO with variable waveform to every 'nth' neat of an instrument .... could get messy with irregular beats ... however, that would require some sequencer circuitry, so it could be added as an option alongside the host synced step sequencer.
I've not managed to date to have a step seq run successfully within an fx plug, but I think I learned enough in the building of 'Flex-N-stein4' to make that feasible
.. the good news is that I'm rather pleased with Varivoli, and so I am keen to experiment and expand the beast!
