TextSpanner in Large Ensemble

[craigbakalian]

Hi,

Is there a way to get a TextSpanner to only display on the top staff of
a large ensemble the same way the \tempo works?  I have an
Accelerando... that is spreading the staves of a large score too far
apart if it is on every staff.  And, the accelerando has to be in all
parts - of course.  Would it have something to do with \startTextSpan
and \stopTextSpan?

Craig Bakalian