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Anyone who dreams of being a drummer in a rock band will welcome John Sagastegui’s electronic tutor (WO 02/45071). The difficult part of learning the basics of percussion is knowing which hand to use and when, especially if all you’ve got to practise on is a silent rubber drum pad. Metronomes will help you keep time but won’t tell you which hand to use, so Sagastegui’s e-tutor tells the student which hand to use using visual signals. The tutor flashes a timed sequence of left and right lights onto the drum pad to tell the student when to use their left and right hands. It also…