I know there will be some HW required (I am guessing a small microcontroller in the cable should be OK, plus some 'support' devices) and the host (I am assuming the Empeg) will need some new custom written software, but nothing too hard to begin with.

So, do you have any experience or knowledge of either the required hardware or software? In other words, are you just asking this as a general question, or are you saying "I am willing to help with the necessary work to get this job done."?