Welcome! The Boss JB-2 manual states it can be controlled with a latching foot switch like Boss FS-5L. Manual for FS-5L states it connects with a 1/4” TS (mono) jack.
So you would need a 1/4” TS (mono) to 1/8” TS (mono) jack lead - any old lead will do, doesn’t need to be audio grade. You connect the 1/8” (small jack) end to the MC6Pro relay port and the 1/4” end to the JB-2
Then on the Pro you need a Preset in toggle mode that sends two messages… 1) a relay tip ‘engage’ command i.e. ‘on’ 2) a relay tip ‘disengage’ command i.e. ‘off’
Thank you Brandon.
Additional quesiton, on the vidio it shows to use the relay ports with a connector piece but if I see in the software editor, I can also do relay switching out of the omniports,
I assume correct that I can just put a TS cable from omniport 1 to my Boss and set it up in the editor, no need for an additional connector piece?
The Relay option for the Omiports are for if you connect the Relay Interface that GuitarWolf has shared. The Omniports themselves do not perform relay switching.