Hello,
As promised I just released version 2.3.1 of PyTone, which you can find under
http://www.luga.de/pytone/download/PyTone-2.3.1.tar.gz
It mostly contains bugfixes including (hopefully) one for the race condition which somethings prevented PyTone from starting up. The keybindings for the rating of the currently playing song have been made configurable.
Enjoy,
Jörg