| 摘要 |
PROBLEM TO BE SOLVED: To make a player easy to grasp the following playing operation. SOLUTION: The previous display LED of a key situated in the middle between a key for which a depressing instruction was performed just before and a key to which the depressing instruction is to be performed next, thereby, a performer is instructed for the following depressing direction. Therefore, the direction of the key to be depressed and this key can be easily grasped. Since the previous display LED 202 is successively lighted according to the time obtained by dividing the time from the depressing timing just before and the timing to be depressed next by the space between the keys, a player can also grasp the musical interval between the key depressed just before and the key to be depressed next. |
