PSR-S975 Midi Setup

[xx69xx]

Hi All,

Hope anyone could help me here. I've just got the Yamaha PSR-S975 and part of it I tried to use it as a sound module as a midi-out source for my music program called NoteWorthy Composer.
I was able to successfully connect my software to the Yamaha PSR-S975 via 16 channels. However, I've got the wrong voices/instruments coming out from the keyboard although I know I set the MSB, LSB and PC to correct values for each channel.

What did I do wrong? Do I need to set up anything on my keyboard? Any advice or guidelines would be greatly appreciated.

Thank you,
Vu Phan