Dakota Melin designed a PCB to have a clock input for the Korg Arp2600 keyboard.
(it’s only for the KORG Version possible with this mod)
I offer this Modification as a PCB only and a build-in Service (customers have to remove the panel and pcb and send it to me)
PCB only: https://www.diysynth.de/pcbs-panels/korg-arp2600-clock-mod-fuer-3620-keyboard-pcb-only.html
based on this:
You need to remove R444 on the top side:
the resistors marked 152 and 562 and both diodes must be removed. IF YOU HAVE NOT WORKED ON SMD BEFORE STOP HERE! Get someone who has experience, please. This is a lead free, relatively delicate board. DO NOT ATTEMPT unless you have done this stuff before.
These three pads are where we are attaching the OUT of the above conditioning circuit. This point is the input to the MCU that it reads for the tempo of the sequencer/arpeggiator.
This picture shows the installed Modification: