adjust the settings to practice your polyrhythms. sorry about the unequalness. scratch doesn't do a good job with that. i tried my best to fix it, but it doesn't work great at high tempos. using turbo mode also may help.
polyrhythms are two or more beats against each other. for example, a 2:3 polyrhythm means that two beats are played in the same time that three beats are.
