The original PS2 version had compressed, tinny audio. In PCSX2:

PCSX2 is a free and open-source emulator for the PlayStation 2, allowing users to play PS2 games on their PC. With continuous updates and improvements, PCSX2 has become one of the most popular emulators, offering compatibility with a vast library of PS2 games, including God of War. The emulator provides various features such as support for high-definition rendering, widescreen modes, and the ability to use keyboard or controller inputs for a more personalized gaming experience.

This is the core of the “100% working exclusive” method. Follow these settings exactly.