Tempo spanners

[Dominic]

(Lilypond 2.19.15)

Dear all,

As you can see from the image and the attached file, I have achieved an
independent text/tempo spanner by creating a special context containing only
the spanner and letting the Score context 'accept' it. I only understand
this technique about 70%, as I hacked it together from snippets I found
online.

Unfortunately, the "rall..." line is 'sitting' on top of an invisible line
created by the existence of the metronome mark. (Removing the metronome mark
allows the spanner to 'fall down' nearer to the staff.)

How can I get both the metronome mark and the tempo spanner to be
interpreted on a single line in the Score context AND still have full
independence of text spanners within individual staffs?

A crude and forced temporary solution would be to do
Score.TextSpanner.Y-offset = #(negative number) on a case-by-case basis, but
in a real-life situation this would not be practical (I am working on an
orchestral score with thousands of bars which needs to be robust)

Any help or insight would be greatly appreciated!

Thanks,

Dominic

<http://lilypond.1069038.n5.nabble.com/file/n172220/tempo-spanners.png> 
tempo-spanners.ly
<http://lilypond.1069038.n5.nabble.com/file/n172220/tempo-spanners.ly>  



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