: If the image looks too "filtered" or soft, hold Power + Up/Down on the D-pad to adjust the hardware sharpness filter in real-time.
PCSX4all is the undisputed king for PS1 on the RG350.
This is not to be confused with "PCSX ReARMed," which is common on RetroPie and ARM Linux devices. PCSX4all is specifically optimized for the OpenDingux operating system that the RG350 runs.