R4 Emulating GBA

Hey, Need a hand.Now, I KNOW you can't emulate GBA games directly from the Slot 1. But I wanted to know what kind of device I need to be able to boot GBA games from the slot 1.I have a Guitar Hero On Tour GBA Slot Peripheral... Will that work?Thanks in advance.

No, the Guitar Hero peripheral will not let you play GBA games.You need a RAM expansion card, like the EZFlash 3 in 1.
http://www.dealextreme.com/details.dx/sku.2967

lol, the Guitar Hero thing only lets you play the game!
You can also use a M3 Perfect, it has external memory.