It is a rhythm game for real instruments. So far I've only got a visualization for a guitar though i plan to have many different types for at least keyboard and drums.
I am using SFML 1.6
At the moment I don't use SFML for much apart from input,loading images and an openGL context. Though I am thinking of having the option for audio to go with a track. A wave file or something similar. Which SFML audio should be perfect for.I do not know about playing at different tempos. Even if speed can be changed then the pitch of notes will as-well.
At the moment +/- keys can increase tempo while playing. That can not really be kept unless There is a 3rd mode separate of training mode. Have no idea what that would be called.
There is no scoring system apart from a little % sign saying the percentage of notes hit out of the entire song.
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