A problem today - wasn't a problem last week. Not a file available as a standard potato file. Also, since it's for midi, and some of us not only don't have midi support but have a visceral hatred of midi ... what the heck is kde doing demanding it? Never mind, but if install task-kde is going to work again on potato this library needs to be provided in potato-usable form.
Whit PS: This is seriously foobared. Pardon my French, but the unstable version of that midi library does _not_ install on Potato.