Hello Peter, If you want to get rid of all dynamics in the piano reduction altogether, you can simply use
\new Staff \with {
\magnifyStaff #5/7
\override DynamicText.stencil = ##f
\override DynamicLineSpanner.stencil = ##f
\override DynamicTextSpanner.stencil = ##f
}
Cheers,
Valentin
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