Set the timescale for the simulation clock. A setting of "1 sec" means the clock advances in real-time, keeping up perfectly with your CPU clock. Higher values make the simulation clock run faster, lower values make it run slower. Negative values make it run backwards.
There are two pairs of up/down buttons. The left pair will cycle through all available timesteps in sequence. Since there are a large number of timesteps, the right pair is provided to skip to the next higher/lower unit of time. For example, if the timescale is currently "1 min", the right up button will make it "1 hour", and the right down button will make it "1 sec"
