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As a former Korg Triton Pro-X-88 owner, please stay away from Korg's if a quality piano sound is important to you.
I tried the stock pianos, the misc. for sale enhanced piano cards, even auditioned a 3rd party piano sound...NONE sounded as good as a Yamaha piano.
Specifically, the bottom and mid ranges sounded very acceptable, but the upper octaves were so thin they were unusable.
I play a variety of styles within my work ranging from jazz, standards, country, oldies and some pop.
Good luck,
Bill in Dayton
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Bill in Dayton