Plays a short vibe every beat.
* Use the slider control in the middle to quickly set the tempo.
* Use the combo buttons on the right to do fine adjustments.
* Exit the app by pressing the left button.
* For a stronger vibe, set 'Vibrations' to 'Strong' in the Settings App.
* Units are (approximately) in beats-per-minute (BPM).
* This app runs even when the screen is off, so use of this app may cause the battery to drain more quickly.