Swing indications in text markup?

[Benjamin Esham]

I am typesetting a piece which has some "swing" sections.  In these
sections, two eighth notes should be played as a tripletted quarter note
and eighth note.  I'm trying to typeset an indication of this; usually, 
it
appears as two beamed eighth notes, an equals sign, and then a quarter 
and
an eighth with a "3" and a bracket under them.

After the swing sections are over, I'd like to show that eighths should 
be
played "straight" by showing two eighths, an equals sign, and another 
two
eighths.  The tricky part here is that the equals sign should appear
directly above the bar line between the swing and non-swing measures.

I suppose the first item is possible by including a \score{} in a
\markup{}, but it seems to me that that would require a *lot* of code
(removing most of the engravers, for example) and it seems like there
should be an easier way.  Can anyone tell me how to do either or both of
these two things?  Thanks!

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Benjamin D. Esham      {      http://bdesham.net
address@hidden      }      AIM: bdesham 1 2 8
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