I've seen similiar in live performance, 'playing' over a midi or bakingtrack,
and the keys being 'muted' or local set to off.
Don't really need any high pricelevel arranger to do this .... wink grin grin

sofa
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Cheers 🥂
GJ
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"Success is not counted by how high you have climbed
but by how many you brought with you." (Wil Rose)