I see, but it's the combination of two models I'm wondering about.
Hello Mr. Fleer,
If you are interested in the combination of two models, THAT might be possible ... if you own both models, and you load two instances of Pianoteq, and set them both to receive the same midi channel from your keyboard. I haven't tried it. Please beware that there might be some phasing problems between the outputs of two different signals, and depending on your computer's power, you might have trouble loading more than one instance of Pianoteq.
About seven years ago, I made a Youtube video of George Gershwin's "Variations on I've Got Rhythm" that used two instances of (then) Pianoteq 3. That was done by setting Pianoteq to receive two different channels. (It's not the same as what I have described as above, with two models using the SAME midi input channel.) By today's standards, this video sounds quaint and not very real, because of only Pianoteq Version 3 and I panned the two pianos too far apart from each other.