Metronome is designed with the practicing musician in mind which means that it's fast and easy to use. Nearly all of Metronome's functions and settings can be changed by using a single key. You won't have to put your instrument down to change the tempo (arrow keys) or the accent beat (number keys). Stop and start by tapping the space bar (or the Enter or Return keys).
All these things can be done 'on the fly' without having to stop and restart the metronome.