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          "ly-fu: could not exec MIDI player '@MIDI_Player $midi_filename': $!\n";
    } else {
        system( @MIDI_Player, $midi_filename ) == 0
          or die
          "ly-fu: could not run MIDI player '@MIDI_Player $midi_filename': $!\n";
    }
}

if ($Flag_Generate_Score) {
    # the files might be shared, so open up the permissions
    chmod 0644, $ly_filename, $midi_filename, $score_filename;
} else {
    # Preview.app got increasingly slower to actually start over time,
    # hence this kluge. Eventually I switched to mupdf, and eventually
    # the 2009 macbook died in late 2022.
    sleep $Flag_Sleep_Kluge if $Flag_Sleep_Kluge > 0;
    unlink $ly_filename, $midi_filename, $score_filename;
}

########################################################################
#