Hi, ToneLib-GFX owner, and I find that I often accidentally click on the windox "x" when I am in "preferences", thinking I am just closing the preferences, but I end up closing tonelib. In an effort to not change the default (people may *love* this), perhaps you could add a checkbox in the preferences for "Warn on closing", and if selected, you would give a "are you sure you want to quit?" message. Thanks!