Grand piano preset tones are larger tones than a hex layer tone.  If the grand piano presets offered wave level editing like a hex layer tone does, you would actually see 8 layers, so it's not entirely possible to put a grand piano preset tone into a single layer of a hex layer tone.  You can choose a single element of a grand piano tone for use in a hex layer.  You'll find 8 grand piano waves to choose from, comprised of 4 velocity layers of samples, left and right channels to make stereo.  In
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