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How many keys do you want?

Something like a Yamaha CK61 would give you pretty light weight and compact 61 note battery powered keyboard with, I think, pretty good samples.

I have the bigger CK88 hammer action version and like it a lot.

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Its not? Yamaha Reface.
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But they don't have an acoustic piano built in (yes, I know, the CP has an acoustic piano as an easter egg, but that doesn't count).
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Playing acoustic piano patches on my reface wasn’t a good experience. Seems all those light actions have hyper sensitive black keys.
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Yamaha’s piano presets are perfectly fine for the intended use case. Have a jam with it, sit it in the mix, you’ll see .. of course it’s not going to be their concert grand ..
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It's not a ROMpler, but Hydrasynth Explorer.
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