Thanks for all your answer;
Dave and Scott,
what a bummer that Yamaha did not allow you to do this, I know you can do this with their Synth. I do like the sound and style of Tyros, I have it for 7 months now, but it's because some of little things here and there that keep me from using it for gig, I keep using SD1 for style and sounds and XP60 for alternate solo voice and string, just to keep things fresh ( at least, to me). But I feel more sastisfy playing piano, Rhodes, and organ sound with both hands on one keyboard. So thanks to Dave and Scott for your knowledge.

Squeaky,
yes I have XP60 it still works fine, I like the warmness of Roland Strings the most.

Fran,
thanks for your suggestion, the thought cross my mind, because Both G70 and PA1X Pro must be at least good keyboard. Again, I love Tyros sound and style, but I like my arranger to have seperate Fill and Variation buttons, and a reset button is a must, looks like PA1X pro have these functions, but thier price is so high, don't kow how to explain to my wife, so I just keep thinking about it then.

Tye