Time Signatures

Time signatures are a feature in StepMania starting from SM4.

This feature lets you change the length of certain measures in the chart. The default time signature used in all songs without any changes is 4/4, which would be 4 beats per measure. Changing the numerator will expand or collapse the measure, for example, changing it to 3/4 will collapse the measure to 3 beats, and changing it to 6/4 will expand it to 6 beats.

It is unknown what changing the denominator does though.