Looking at page EN-27 looks to have a Portamento On/Off... would this mean that this can be used for Mono type synths? This was something that was missing from the PX-5S. Also, the 560 can layer up to 4 Hex Tones, one on each of the Upper1/2, Lower1/2 layers meaning it's got a more powerful processing engine than the PX-5S. I think that's right?...