+---------------------------------------------------------
|  Internal 7byte data <--convert--> MIDI 8 byte data                                    |
|  example: Internal data(bit image) MIDI data(bit image)                                |
|                Aaaaaaaa            0GFEDCBA                                            |
|                Bbbbbbbb            0aaaaaaa                                            |
|                Cccccccc            0bbbbbbb                                            |
|                Dddddddd            0ccccccc                                            |
|                Eeeeeeee            0ddddddd                                            |
|                Ffffffff            0eeeeeee                                            |
|                Gggggggg            0fffffff                                            |
|                Hhhhhhhh            0ggggggg                                            |
|                Iiiiiiii            0NMLKJIH                                            |
|                   :                0hhhhhhh                                            |
|                   :                   :                                                |
|                Vvvvvvvv            000000WV                                            |
|                Wwwwwwww            0vvvvvvv                                            |
|                                    0wwwwwww                                            |
|                                    11110111 (EOX=F7H)                                  |
+---------------------------------------------------------