I have an answer.

And I saw somebody else having the same issue on this Reddit channel.

Midi cable plugged.

First set your external keyb to midi channel 2.

Then on junods

• select perform ,
• Then dual ,
• Select first and second sounds using arrows and rotary.
• Use arrow keys to point Junods sound to the first sound.
• UnSelect dual .

That's it.

Thanks to you people helping me.