I've been meaning to make the progress bar synchronise with the beat
rather than a continuous countdown, just to give the overlay a bit more
of a rhythmic feel.
Not completely happy with how this feels but I think it's a start?
I had to refactor how the break overlay works in the process. It no
longer creates transforms for all breaks ahead-of-time, which could be
argued as a better way of doing things. It's more dynamically able to
handle breaks now (maybe useful for the future, who knows).
