Hi chumley,
preserving is a feature that disconnects your VE PRO instance from your sequencer (and makes it "feel" like a standalone VE PRO). This way you can keep your setup loaded and switch to the next cue, then reconnect to your preserved session - without reloading any samples.
Of course VE PRO is also 64 bit on OS X, so you can load as many samples in 64 bit sample players, like the Vienna Instruments, as possible. Start your VE PRO Server (64 bit), insert VE PRO in your sequencer and connect to this instance.
Create your template, then preserve it and it will stay open and available when you open your next song/cue - you just need to connect to it via the VE PRO Server Interface.
Did you check out our videos yet? I have done my best to make the process easy to follow.
Best,
Paul
Paul Kopf Product Manager VSL