Issue 319 in project lilypond

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Issue 319: metronome as a scheme number
http://code.google.com/p/lilypond/issues/detail?id=319

New issue report by gpermus:
I was wondering if the metronome number in a \tempo command could be a
scheme number.  This would make it easier to do effects for fermata and
ritards and relative tempo changes, in midi files.

For example, it would be nice to be able to do something like this:

----------------
#(define base-tempo 100)

\tempo 4 = #base-tempo

% some music
% insert markup for "half note = dotted quarter" metronome mark
% and override so the following is invisible in the score

\tempo 4 = #( / ( * base-tempo 3) 4)
---------------

This way, one could change the base tempo in one place, and all the tempi
would adjust automatically.




Issue attributes:
        Status: Accepted
        Owner: gpermus
        Labels: Type-Enhancement Priority-Low

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