nandu,
The Z1 is a synthetizer that is not based on samples but on "physical modelling", and the acoustic piano is not in the scope of the Z1. As you said, you had to read the specifications and try it before to buy...
BTW I love that MOSS synthesis and I use it a lot, combinated with PCM synthesis on my Trinity and Triton
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Regards,
Xavier
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Alchemist - the Korg Trinity to Triton PCG and SNG converter -
http://alchemist.sourceforge.net