Set the output verbosity of the invoked @command{lilypond} calls to
@var{loglevel}. Possible values are @code{NONE}, @code{ERROR},
@code{WARNING}, @code{BASIC_PROGRESS}, @code{PROGRESS}, @code{INFO}
Set the output verbosity of the invoked @command{lilypond} calls to
@var{loglevel}. Possible values are @code{NONE}, @code{ERROR},
@code{WARNING}, @code{BASIC_PROGRESS}, @code{PROGRESS}, @code{INFO}