How to enable Dolby Pro Logic on GT4

[n1nj4ofshr3d]

I really need help with this, I have a Sony 5 speaker, 1 subwoofer Surround sound system.
It says it can enable Pro Logic, and I've only done it with my big HDTV through the optical out in the TV, but never with the PS2.
It says Pro Logic on the screen of the system along with opt, but with the big screen, it scrolls Pro Logic, saying that it is enabled.
Can anyone help?
P.S.- There is no setting for Pro Logic on the system.

 

[DKLion3s]

Through the options menu to the sound (speaker symbol) options. There is three options: Mono, Stereo & Dolby 5.1-Pro-Logic. Select accordingly.