I also have trouble with DSP games... =[ I use Mario Kart as pass-through kart but the cart itself doesn't run properly through the SWC, even if I dump it first. Ballz does work though. Haven't tried others, because they may glitch because they're NTSC.
> Anyway, it's a great machine. By the way, you can't NTSC modify your SNES if you bought the PAL version of the SWCDX2.
You can; the PAL/NTSC thing with 50 vs 60 Hz is a entirely different thing than the lockout chip. See http://www.gamesx.com