One cable has to be long enough to reach from your guitar out to your amp. The other has to be long enough to reach from you OBEL jack to your pedal-board. This cable will split into two mono ends. These have to be long enough to plug one into your pedal-board’s input and the other to the pedal-board’s output. Or, if you use a junction box, like the Hubbub, both cables need to be long enough to reach the box, then you will need a cable long enough to reach from the box to your amp, and another long enough to reach from your box to your pedal-board, also with two mono ends.
Bill, tgo