In Yamaha MX61, how can I save split/layered performances and call them up instantly during a live performance? As far as I know, only individual voices can be called up using part select button. I'm planning to buy MX61. I'll be using it mostly for live. Also thought of buying Korg Kross 2, but I'm worried about its sounds (esp Piano) and keybed quality. Please give your thoughts on these two boards.