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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.
+-----+--------+--------------+---------------------+---------------+--------+ | | 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 | +-----+--------+--------------+---------------------+---------------+--------+