Cutting Roland Guitar Synth Cables

I have cut my 13-pin and 24-pin Roland guitar synth cables and soldered DB25 connectors onto the exposed ends for use with several different projects, including the GR-50 Sustain Modification and the GK2a/GR300 Interface. On each cable, one male and one female DB25 is used so that the exposed ends can be plugged together and the cable used normally. I wired the cables in such a way that no damage will be caused if you were to accidentally plug one end of the 24-pin cable into the other end of the 13-pin cable.

Cutting the old 24-pin cable

Cutting the newer 13-pin cable

Wiring for both cables

+-----+--------+--------------+---------------------+---------------+--------+
|     | 13-pin |              |                     |               | 24-pin |
|DB25 | cable  | 13-pin cable | 24-pin cable color  | 24-pin cable  | cable  |
|Pin  | color  | Description  |    and dot code     | Description   | pin #  |
+-----+--------+--------------+---------------------+---------------+--------+
|  1  | Red    | String 1     | Wht --- - - -       | String 1      | 19     |
|  2  | Pink   | String 2     | Yel - - - -         | String 2      | 20     |
|  3  | Yellow | String 3     | Wht - --- ---       | String 3      | 21     |
|  4  | Dk Grn | String 4     | Wht --- - -         | String 4      | 22     |
|  5  | Lt Grn | String 5     | Yel --- - -         | String 5      | 23     |
|  6  | Orange | String 6     | Wht --- ---         | String 6      | 24     |
|  7  | Lt Blu | Reg Guitar   | Wht --- --- - -     | Reg Guitar    | 18     |
|  8  | Dk Blu | Syn Vol 0-5V | Wht ---             | Syn Vol 0-12V | 9      |
|  9  | Gray   | NC           | NC                  | NC            | NC     | 
| 10  | Brown  | S1           | NC                  | NC            | NC     |
| 11  | White  | S2           | NC                  | NC            | NC     |
| 12  | Black  | +7V          | NC                  | NC            | NC     |
| 13  | Purple | -7V          | NC                  | NC            | NC     |
| 14  | NC     | NC           | Wht --- - - - -     | Syn Switch    | 16     |
| 15  | NC     | NC           | Wht --- --- - - -   | Dis Switch    | 15     |
| 16  | NC     | NC           | Wht                 | Master Vol    | 8      |
| 17  | NC     | NC           | Wht --- -           | Filt Cutoff   | 11     |
| 18  | NC     | NC           | Wht --- --- - - - - | Filt Res      | 12     |
| 19  | NC     | NC           | Yel - - -           | Hex Fuzz      | 17     |
| 20  | NC     | NC           | Wht --- --- ---     | Guit Vol      | 10     |
| 21  | NC     | NC           | Wht - - - -         | Ground        | 6      |
| 22  | NC     | NC           | Yel - -             | Vibrato CV    | 14     |
| 23  | NC     | NC           | Wht - - -           | +15V          | 1      |
| 24  | NC     | NC           | Yel ---             | -15V          | 2      |
| 25  | Shield | Ground       | Wht -               |               | 3      |
+-----+--------+--------------+---------------------+---------------+--------+