http://psxdatacenter.com/ is a good place to pick up on settings on each game
For Legend of Manor (U) (The USA version of the game they recommend using)
Emulator ePSXe v.1.7.0
Video Plugin Pete's OpenGL Driver v2.9 ( internal X & Internal Y= Very High, Stretching mode: Stretch to full window size, render Mode: 2 (Use framebuffer object) text filt = 2 FPS limit= 63, Compatibility=2,3,2; Shader effects= 1 (Fullscreen smoothin))
Audio Plugin ePSXe SPU Core v.1.7.0
CD-ROM Plugin ePSXe Cdrom plugin
Game Pad Plugin N / A
Vibration Compatible Yes.
Console Bios Used SCPH7502
The same should apply to ePSXe 1.9.0 though you can try 1.7.0 a swell anyway just rename the main ePSXe.exe to ePSXe170.exe and drop it in the same folder as ePSXe and it will share all the settings that 1.9.0 uses it is only 1.6.0 and older that will not as it uses a different core and stores the settings differently
P.S. if you can not use that version of OpenGL you can just use the normal OpenGL as the above that is OpenGL2 uses advanced features that not all graphics chip sets can use but the original OpenGL can use the same settings