What firmware are you running?
I'm perfectly aware of the fact that we might have to recompile with the 1.92 SDK for all firmwares below 3.41. The next version will cover both bases (lesser than 3.41 and 3.41) - in the meantime, you have to recompile for yourself (instructions on how to compile with 1.92 SDK are in the README)
The PSP ports don't run at fullspeed anywhere and have to resort to frameskipping. And none of them are using SNES9x 1.52, so you don't get blargg's sound core and therefore a good portion of the sound effects are totally wrong,