I’m really loving Cantabile 4, and the UI looks just that bit crisper and cleaner. Nice work Brad!
I do have one tiny feature request, which also applies to Cantabile 3. When you bring up the Show Notes editor, it would be great to have a keyboard shortcut for closing the editor, equivalent to pressing the OK button. I’m a heavy keyboard user, and I’m often going in and out of Show Notes to make tweaks, and it would be more seamless just to hit something like Ctrl-Enter or suchlike (obviously Enter won’t work as that’s needed in the editor itself).