Seems like a great idea, 'tho I can't (I hope yet) try it on Android. How do you select the rhythms? Can people make their own rhythms to use later (maybe a sharable library)? Are there some potentially quasi-useful ones, such as beat patterns in specific music, or maintaining exact 1-second beat intervals? Rhythms to try to sync certain brainwave patterns? Seems like a lot of possibility space out there...