On Wed, 2016-03-02 at 14:37 +0000, Graham King wrote:
Is there a magic spell to soothe lilypond in these circumstances? It
might seem like nit-picking, but there are so many of these errors in
the score that they are obscuring other, more important, messages.
Brian Barker has kindly answered this part of the problem, off-list, with:
#(ly:expect-warning "Impossible or ambiguous (de)crescendo in MIDI")
which suppresses the messages, one at a time, and also provides a
convenient way to mark their cause at source in the lilypond code.