There is a remarkable difference in the solo sounds. I'm really digging the electric pianos and the synth lead sounds are fantastic. 
This may sound funny, but it seems like Ketron looked at their previous keyboards and organized the sound categories more like the older keyboards.
Of all the style categories, the dance styles are very much improved, very modern ( what you hear on the radio) sounding. Love it.
All I need to do is get use to the harmonizer. I'm so use to the SD1 that it's been a big change for me on the Audya.