How can I change Midi channel Sounds? CLP-280 Yamaha Clavinova

by Francis
(Barcelona)

How can I change Midi channel Sounds, so that it plays the real piano sound or guitar and not those from the XG Bank?

I have a CLP-280 and when I play a midi song from my USB Pendrive I would like to change the piano sound. Because the one it uses is from the XG Bank Midi library. And it sounds very very poor compared to the "Grand Piano1" that is the Big sound of this CLP.

So my question is, which menu i have to go...
or how can i change the instrument of the midi channel in order to be able to select the real voices and not only the XG ones.

Thanks for your attention
(and sorry for my poor english, im spanish.)
But hope you understand what i'm trying to do