While developing a Playback View in Denemo (music plays back while
LilyPond-typeset SVG is animated, building on Mathieu Demange's work) I
came across a bug in event-listener.ly:
In this procedure
#(define (format-tempo engraver event)
(print-line engraver
"tempo"
; get length of quarter notes, in seconds
(/ (ly:event-property event 'metronome-count)
(format-moment (ly:duration-length (ly:event-property
event
'tempo-unit))))))
The division should be a multiplication, otherwise \tempo Presto 4=480
and \tempo Presto 2=240 result in different tempi being written out.
Richard
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