Playing multi PSX backup games in PS2

[Cia Agent]

Hi.

I have a PS2(US, v4) with NEO2.2 chip installed. I use the RegionX to play PS2 backup games. It works fine.
I use the GS2 1.6 to play my PSX backup games and it works fine too.

My problem is the following: Will my PS2 play successfully multi-psx games such as Parasite Eve2, FInal Fantasy and so on?

If so, how should I proceed? I suppose there must some some special method to run multiple CD games.
Has anyone ever played multiple CD PSX games on PS2????
Please help me. Im a great fan of Final Fantasy series.