ofxBpm
BPM Addon for Musical Apps.
Listener function will be called by addon on set timings. You can set BPM (Beat per Minutes) and BPB (Beat Per Bar) to this addon. For example, if you want to listen 4Beat on BPM = 120, then set BPM to 120, BPB to 4.
This addon uses ofThread. You could not call draw function on listener.
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Tested on Max OSX 10.8.4 openFrameworks 0.80