Need help with my Casio PG-300!

I have some problems with my Casio PG-300.
1.  Internal Synth Sounds of my guitar is totally different from  
Internal Preset Synth Sounds that shown at  
http://jpsongs.com/troubadortech/pgsounds.htm
Can i correct it?
2. The synth output is very noisy. How can i fix it?
I have not manual.
Thanx for any help.

Dimitry.


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