Hi,
definitely interesting might be, that the autographs from Schönberg
himself doen't contain this special symbols, but he set a cross instead
of a notehead. Confer to
http://www.schoenberg.at/6_archiv/music/works/op/compositions_op21_sources_e.htm#
for instance page 12 of the cathegory B. I remember some explanations
though that his intention was to keep the specified singing voice level,
so the printed version might match his intention more.
Greetings
Till
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