Thanks for the detailed explanation Jokeyman. I think you helped me make up my mind. For one thing, I didn't want to spend that much just to plug in the AX-1 to play on stage with my band. I don't want to have to drag all that stuff along with it as it kind of defeats the purpose and would probably be a challenge to get it all working like it's supposed to. I think it might be time to part ways with it (possibly on Ebay) and invest what it brings into something else more useful. I still think the WK6600 was a good value for what it cost me. It replaced my Roland D-50 (mother board died) and I think the key action is just as good and the variety and quality of some of the sounds are even better. Using the AX-1 with it was just kind of a fun thing, but that's all.