PocketSNES was added in today's nightly and the "farting" noises are fixed. It is glorious
However, the sound emulation is still inaccurate, such as mario's spin jump and the going down the pipe sounds (kinda like ZSNES). I don't know if this due to being based of SNES9x 1.39 or something else.
Otherwise, it is the best emulator speedwise. The dev/s is doing a really good job porting this over to the 3ds.
EDIT: The regular CatSFC (NON plus version) have the same sound issues. It would be nice is the sound emulation from the Plus version or Next is implemented in PocketSNES in the future. But for now it is the only 3ds emulator that runs Mario RPG at fullspeed.