I tried pocket ISO, even kept the table file, no difference from a regular rom. These titles run on PSX4DROID but not on FPSE. Metal Gear Solid has no sound and goes blank after you leave the title screen. Medal of Honor the music quits after two seconds and the levels are cut in half. A black void sits in the middle and you can't cross it. That's true of the sequel as well. FFVII terrible sound and the error that leaves you defenseless in battles.
The sad thing is, these titles used to work, same android device and same app. Some update happened fixing something that wasn't broken and these titles stopped working.