Easiest way to stay steady while maintaining a human feel.
I took to this app the first time I ever used it. I have it installed on an old 3GS for back up. Sometimes I put the extra (the 3Gs) on the floor close to the bass player so he can have his own reference. I use it on my iPad for non-singing gigs and on my iPhone for all the rest. A must have for any serious drummer or bass player wanting to rein-in an errant drummer! It works on the floor, sitting on my bass drum or mounted on a stand!
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liveBPM - Beat Detector, v1.2.0