Re: QT app for Raspberry Pi that can play Midi - tools?
As far as I can tell this is the actual question you are asking.
Can anyone suggest a good, clean, midi output (with timing) library for use with QT?
The answer is that it has nothing to do with Qt.
What it seems you are looking for is some sort of a backend lib that can do midi output, and if I understand correctly what you want then is to implement a UI using Qt.
You can use any library with Qt - this is why there is a linker.
Once you found your midi lib of choice, you can build a UI with Qt for it.
Do you write clean code? - if you are TDD'ing then maybe, if not, your not writing clean code.
Watch these videos, and read his books they are must if you want to write clean code:
Recommended off-line reading Qt:
The Foundations of Qt Development (ISBN: 1-59059-831-8)