the gba can duplicate any effect on snes (even if perhaps some may need to done in non tile mode?), but i'm wondering about speed - i hear good performance you need 5 times more power than what you're emulating (i'd guess snes cpu about less than 1.5mips and gba's 20mips) but then you've the special effects chips described as '10/21 mhz' - do you think near full speed could be achieved?
well i think its impressive if you can get this working at reasonble speed