Remove Empty Stave but not all

[Helge Kruse]

Hello,

Currently I am writing an excerpt from a 20th century work for the 
rhythm group. \RemoveEmptyStaves reduces the lines without notes 
dramatically.

But there are a lot of time changes also in the measures where no rhythm 
instruments plays. Now I get all the rehearsal marks for these measures 
and bar numbes at the beginning of the lines
but not measures and no staves.

I could introduce a dummy staff without \RemoveEmptyStaves that would 
show all the rhyhtm. But this dummy would take space on the other pages.

How can I show such a dummy staff when nothing else is visible but is 
hidden when at least one other staff is not empty?

Is there a tweek where I can inhibit the effect of RemoveEmptyStaves for 
some measures?

Regards
Helge

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