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I’m not sure quite what you’re describing here: are you referring to real-time MIDI recording, or step input, or something else? This problem occurs on playback, or something else? If it’s still reproducible, can you please attach the project here? (I sound like a stuck record, but please allow me to reiterate again: Dorico is a document-based application, and in order to understand, reproduce and fix problems, we need the documents.)
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It’s counter-intuitive, but dynamics for percussion kits need to be added on the individual instrument staves, rather than when you’re looking at the 5-line staff or grid presentation type. So go to Layout Options, choose the Players page, and set your percussion kit to show as individual single-line instruments. You can now very quickly add dynamics to all of those instruments in one go using the new features added in version 2.2, and these will then play back even when you choose to show the percussion kit as a 5-line staff or grid.