rosetree,
You raise an important point. For most of the AjamSonic sound development, the sounds were optimized for live PA speakers (keeping in mind that some of the factory sounds were already optimized for studio use). This way, you get a fairly balanced instrument that operates under both conditions quit well I must add.
This new Stereo Grand piano sound was developed for live use and as such optimized to be used through PA speakers. I am glad you enjoy(ed) it! The GP1 also offers way more editing capabilities than the KlaviPro - but then again, for a slightly higher price tag too :-)
Thanks,