Ok Jeff the Ninja (Jesus Christ that's a lame fucking name) it's just badly emulated on all variations of MAME.
The fact it has video/sound emulation that ISN'T 100% ACCURATE suggests it's badly emulated. ;O
Emulated on SATURN however, it should be fine. ;]
Saturn version goes for like, $100. :o
Shame yours is a COPY, Blue.
From the parts I've played that weren't screwy, it seems pretty damn awesome.
Just for the record, what's your favourite scrolling shooter, Blue? ;O
You seem to know your shit.