It is far more common to indicate an open string with a “0” rather than a circled zero, but the tool only offers numbers 1-5, so I am hoping a zero could be added. As I play 8-string guitar, I would be much obliged if the circled zero be substituted with a circled 8 (though perhaps this would negatively affect bowed string players, I’m not sure). A related issue is the tool palette freezes periodically, requiring me to press the home button and reload the file to get the tool responding again.