KAHAYAN Proaudio 8x4 MIDI Selector Operator's Manual page 11

4-THE MIDI CHANNEL:
By default the Selector works in the MIDI CHANNEL 1. If you need to change it
to 'omni' to receive all the MIDI CHANNELS please follow these steps:
1-Turn off the Selector.
2-Open your MIDI Selector unit: Top cover.
3-Go to the MIDI Pcb and just remove the jumper number 1 as you can see
below:
JUMPER 1
4-Close and turn on the unit.
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