"jwm-audio-editor.png"  is based on  an icon obtained  from  "The Noun
Project";  which stated that the icon was distributed  under "Creative
Commons Attribution (CC BY)" but could be used "without attribution".

Links as of December 2021 [these may have broken since then]:

https://thenounproject.com/icon/audio-2892153/

https://thenounproject.zendesk.com/hc/en-us/articles/\
200509798-What-licenses-do-you-use-