@Synthfox no special cables needed, for RH final case assembly, just attach
Core -> LeMEC L -> LeMEC R -> Jog -> LineTX
Core -> Jog -> LeMEC L -> LeMEC R -> LineTX
For testing (outside the case) it’s easiest to test in the LH configuration with the SEQ_L file, as shown in the video - no need for different cables, just a different order.
Please always use the left-side J89 inputs and right-side J89A outputs of the boards.