Some major improvements on the SD9:

1:Now you can eq your audiodrums with boost,loudnes 1,2,3 and bas,mid,high damp,
2.Dsp section with everything on board,compressor,chorus,delay,
you can create real live sologuitars,James Last trumpets,the Billy Vaughn sound(50/60 sound)Shadow guitars etc.
3.New groove section with latin group(very good)and many more
4.Editing on your computer,so much more easy.
5.Loading time wav.mp3 from USB,load and it's done,very fast.
6.All stylessection on your lefthand and the solopresets on your righthand,no more crossing with your hands(Audya)while you are playing.
7.And the touchscreen,so very good,wide open,reacting time very fast,superb.
8.And the sound,so much better,more open,superstereo with the stringsection,completely new organ bank,also the braassection,and the synth group,almost new sounds.

This is only the first impression when you have made your first registrations,and now we go deeper inside and find more improvements.