Patent ID: 7723598

Claim:
An electronic proof system for giving a human player a notice of incorrect manipulation on a manipulator manipulated for changing an attribute of music sound, comprising: a data storage storing pieces of music data expressing the amount of target variation of said manipulator; a detector monitoring said manipulator, and producing pieces of detected data expressing the amount of actual variation of said manipulator; an actuator provided for said manipulator, and responsive to a driving signal so as to move said manipulator; and a controller having a data processing capability, connected to said data storage, said detector and said actuator, comparing said amount of target variation with said amount of actual variation to see whether or not said manipulator is properly manipulated, and supplying said driving signal to said actuator in the presence of a certain amount of difference between said amount of target variation and said amount of actual variation so as to give said notice through a tactile impression on said manipulator to said human player.