I'm sure it is. I tested them on two separate SX900s. And everything worked fine on the PA4x.
Also, when you put a CDG in a Registration on the SX, it will pull up the MP3 part, but not the lyrics. These are almost certainly bugs, and can be easily fixed by Yamaha, if and when they get around to it.
Another boo-boo; on the Yamaha, in order to change the pitch on an audio file, you must go into the audio menu, select and press a tiny little box that says pitch shift. On the Korg the Transpose function will change it immediately. The Transpose doesn't work on audio files in the Yamaha.

Thanx everybody for the thoughts on what to get.
Not much to choose from anymore arranger kb wise which is sad.
the only units I have yet to touch is the SD90/60, Genos.
or whatever the Medeli is?

http://www.medeli.com.hk/x10

Donny, did you consider Kurzweil's arrangers?

http://kurzweil.com/product/kp200/

That would be Medeli with a different label. As someone explained, it is sort of when a company wants to have cups or pens with their logos, but do not want to produce ones, so they order other company to produce it for them. This is what Roland, Kurzweil and Casio (MA-150) did with Medeli. Obviously, people who buy these Medeli products thinking that it is something else eventually feel that they were lied to.

Has anyone been very successful with using vArranger program, sound module,
and a controller with their computer?