Dear Shubid,
welcome in this fantastic Forum, where you will be able to find many answers to your doubts regarding the complex operation of the powerful arriving baby!
I have Genos, and love it. But it took several months to decide between Genos and SX900, because of its price/quality ratio, transportability and of the onboard excellent speakers, considering that the sound quality and basic features are not to far from Genos, for an average player.
I also had an Hammond (L122R) with Leslie cabinet, and started in the 60's with Farfisa organs, at that time the best combo organs in the world.
For about 20 years I had Korg worships only, very good. But Lately I turned to Yamaha, and liked the easy approach of the operating system, sounds and styles. I believe that Genos and SX900, in their respective market range, are the best choice today.
Today good arrangers are unbelievably powerful comparing to the early instruments, and I'm sure you will intensively enjoy you SX900.
Waiting for your keyboard to arrive, I would suggest you to download the Owner's Manual, in pdf format, and start to familiarize with the various functions and commands. Once you will have the keyboard, you can go deeper with the Reference Manual, for more advanced features.
This Forum will be very precious to learn what -often- is not enough clear in the manuals, and also to discover tips and tricks from experienced Forum members.
So, welcome again!
Ciao
Angelo