You must specified a volume (dynamics) with logique (de)crescendo
ditto the midiMaximumVolume and midiMinimumVolume do not equal.
this example return
programming error: (de)crescendo on items with specified volume.
\score {
{
\set Staff.midiMaximumVolume = #0.5
\set Staff.midiMinimumVolume = #0.5
b8 a4.\f\> ^"rit." r8 f8 \! \p e f
}
\midi { }
}
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