Controller for an electronic keyboard instrument that can be folded up and rolled up

A controller electrically connected to a keyboard consisting of a set of white keys and black keys through a flexible ribbon cable for controlling the operation of said keyboard, the controller comprising:

• an external operating interface, said external operating interface comprising a speaker, a display, and a set of operating buttons respectively mounted on a cover shell thereof;
• an internal control unit, said internal control unit mounted inside said cover shell of said external operating interface, said internal control unit comprising a microprocessor, a memory, and a power unit;
• wherein said microprocessor has an input side electrically connected to said flexible cable and said operating buttons of said external operating interface, and an output side electrically connected to said speaker and said display;
• said memory is electrically connected to said microprocessor and controlled by said microprocessor for data access;
• said power unit provides electricity to said microprocessor.