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I think this could be more a gripe with your sequencer then. I'm a Sonar guy, to upgrade on a single project basis, I would bring up a Kontakt 2...
I agree that having all the different versions in play is a concern. I went through a migration a few months ago and it was no fun. So yes I...
it's better that way Imagine the uproar if they did overlay the .dll and somebody's project got screwed up or even the sound engine changes...