The GK-Set is exactly what you need for integrating the Nu-Multi-6 pickup with Roland gear via the 13-pin GK connector. Check out the Nexus GK document for the GK use-case.
This set includes the Nexus Basic ($169.99), 12V Power Supply ($9.99), GK-MIDI Board ($112.99), CV Pot ($14.99), 2-Way switch ($11.99), Multichannel Cable ($84.99), and 19-Pin Output Jack ($34.99).
There are a couple of options to choose from for the Nu-multi pickup. Choose the right option using the dropdown menu, or choose the plain Nexus GK GK set if you prefer a custom Nu Multi pickup.
Note: Please do not be confused with MIDI control and MIDI conversion. The Nexus-GK does not perform any pitch tracking and pitch to MIDI conversion.
Available on backorder if not in stock. Estimated lead-time is 3-6 weeks.
Take note that the right-angle jack is in the guitar side. The other side still has the straight jack to properly connect to the Nexus breakout box.