For those who think that one kind of time signature is not enough, Polytrome is a metronome that can play any number of time changes.
This unique compact graphical user interface mimics a clock with the long hand for the beat and the short hand for the repetition. The number of the current beat is also shown in the center.
The Speed can be adjusted with the dial above the beat view. It ranges from 40 to 240 quarters per minute. Tapping in the middle starts and stops the playback. The volume is displayed below the beat view. Tapping on it shows the volume slider.
The time changes can be stored and recalled as different songs.
A detailed manual can be obtained from the website.