Thanks for all your comments and help,

Shakil you were right. Thanks,
I just realised that it was my mic volume. And the high eq'ing made even less noise when I put the volume up.

I was getting suspicious of the power supply of the keyboard because sometimes it was making some noise on the keyboard.

Anyway, I would like to comment that if anyone's using the 9000pro or any other PSR that uses a mic input, to put the mic level to zero when you are not using the mic. It makes a significant noise on your keyboard output.

Sunny