Ok, I see what you want to do, well no idea or another synth can understand the signals fro the AX 60, but the cable is no problem.
The cable used for the Roland GK-2A midi guitar pickups into the roland GI-10 , is the same cord.(the reason I know his, is that I have them both..)
You will have to modify one end of the cable, though and nobody knows or it works.
There's f.i. another output on the AX 60 synth for sending arpeggio to other gear, but that is a positive 7 volt signal, while it should be a negative 7 volt signal to get it working, so no idea.
But the idea is interesting.
Let me know if it works,
Keyboards/Sound Units: Kurzweil 2600S, Roland VR-760, Acces Virus C, Roland G-800, Akai AX60, Minimoog, Machine Drum, Roland R8-M, mediastation x-76