I think he knows that Dave, as do I , quite well....I am talking about a re-routing of the main outs signal, on the actual circuit board. This could be achieved by soldering bridging wires from the main outs circuit to the 1/2 outs circuit.

But as I said I would strongly recommend against it.

Essentially a "piggy-back" sort of thing..Unless you are into electronics you possible may not get what I mean. NO offence intended, as I do not know your skills set

The Korg headphone out does not lend itself too nicely to running into a desk. The only way is to run it into the TAPE IN/OUT RCA jacks (if the desk has them) these are setup for the type of high impedance signal from headphone stereo jacks.

Dennis