FF7 PSX Experience Multiplier

[iAtoria]

I am looking for a gameshark code that allows me to alter the exp plus multiplier values for the game.  A plus 100% exp is nice, but I am looking for a 400% or even 800%.  I read this post a while back:

For the PSX NTSC version,

Code: [Select]
800694f8 [][]          Init with 0. Add materia exp modifier (Exp Plus) (0x18 0x20). Limit to 0x64. Limit to 0x20.

As you know, a Level 2 Exp Plus materia grants a +100% experience boost. 0x64 is about three times 0x20, so if your code writes 0x64 to address 800694FB, you should be able to roughly quadruple Experience gain.

Can anyone interpret this and form a gameshark code from this?