[sdiy] How to change MIDI channel on an old Roland E-5 keyboard ??

[Jean-Pierre Desrochers]

Hi list,

I recently acquired a vintage Roland E-5 keyboard that I'd like to use
as a MIDI controller for other MIDI stuff.
The problem I have is that it is stuck to MIDI channel#2.
The owner's manual does not talk about how to change the channel number..
Can anybody help ?
Here is the link for the owner's manual.
https://www.manualslib.com/products/Roland-E-5-3268645.html

Thanks.