The LED display 660 can be attached directly to the hand-held bell 700, as shown in FIG. 8A, or the LED display 660 can be held by the hand that is not holding the bell 700, as shown in FIG. 8B. The vibrator 604 can be attached to a body part such as a wrist, as shown in FIG. 8C. There can be a total of eighty-eight signaling devices 670, (corresponding to the maximum eighty-eight keys of an elect