There aren't any midi files in ff7 PSX for the sound effects. Akao wrote a program to create the file effect from samples. It's literally impossible to recreate the sound without recreating his program and how the PS1 sound chip uses the data it is supplied. It's not a case of "finding a midi" - none exists. Nothing exists at all except for a few samples and the program he wrote to tell the PS1 sound chip how to make those samples play - and his program uses jumps and all sorts.
If I can get the PSX to play the effects in isolation, then I can sample them perfectly.
Actually, if you have a recording of these effects in isolation, I can sample them and make a PSX parity soundbank