Anyone else tried this effect? I'm just using the demo, but it sounds great: gives you four speakers. Try the "enveloping studio" preset, and also try moving the side speakers so they're just slightly behind the ears (at about 92 degrees) on the head in the diagram, and then lean down towards and close to the keyboard.
(I think this is something I've just realized I've been missing--the way the keyboard sounds when you lean down on it like that when you're concentrating and listening. Which means that, yes, the sound comes from above your head, and if you lean far enough forward, slightly from behind. Nice sound, in any case.)
In any event, the effect sounds even better if you add a little delayed lpf with resonance and an lfo on a slow cycle. Nice stuff.
Note: Leaning too far forward towards a piano or keyboard may cause unexpected gravitational effects.
I haven't listened much to other 3D simulations, but this sounds good to me--for piano, at least. Great for any sympathetic resonance samples\simulations\pedal down samples with a lot of harmonic content--emulates one's experience at the piano, where the harmonics seem to come from everywhere. Also seems to give soft layers a little more presence. In fact I had to tweak my velocity response a bit so they had less volume. A low pass filter on the soft layers gave good results, too.
Try using the Smooth filtering, too. I also want to hear how it sounds with PianoVerb, but this will make me want to play all day, I suspect, so I'm putting it off.
I don't have Giga 3, so I have no idea what it would sound like with convolved samples and Rewire. Probably would take up a lot of memory. Might be very good.