Clip n Tap
I found from my experience and others that playing the drums with a metronome was hard to set up and get going, which is a fundamental problem because keeping in time is essential for improving your drumming skill.
Clip n Tap allows for quick and easy interaction between the drummer and the metronome.
Just CLIP it to the rim of any drum. Then you are able to set any tempo by TAPPING on the drum pad, which allows for quicker alterations, then using the simple app to control the tempo.
