In case anyone asks, you can put GS3 and the samples out of the box on one IDE drive and it will "work". But not in rewire mode. Too much latency. And only 100 voices at a time. Beyond that it cracks, pops, and drops notes.
Is it just me or is it the out of the box samples that make it difficult to arrange anything I like? I trust it will be easier when I upgrade my computer and get KH Emerald.
Here's a trick for the string and brass ensembles that ship with GS3 Orchestra: On the string and brass ensembles, stack the Staccato 1&2 patches with the mod-wheel sustains. Use high velocity when you need a fast attack, and low velocity for slow attack. Use the modwheel to control the sustain volume. It's quite playable, and can be used for faster melodies as well as slow pads.