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the blue cable connects ground from MIDI out to the MIDI IN jack.
Battery Tray
You will need 5x 1.2V AA batteriesbatteries, get the ones from IKEA, they're from the same factory as the Eneloop ones but for a fraction of the cost.
Unless you can find a 5x AA battery tray best bet is to 3d print your own.
Then follow the official guide for installing the battery tray.
It is important to fit a 10 Ohm resistor as in this photo.
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